(CNN)As rescuers search through the debris of a deadly South Florida condo collapse for a sixth day Tuesday, families of the missing are desperately seeking information about their loved ones and investigators are trying to figure out the cause.

At least 11 people have died in the partial collapse of Champlain Towers South in the beachfront community of Surfside, and 150 remain missing following the tragedy. More than 136 people have been accounted for, according to Miami-Dade Mayor Daniella Levine Cava. The deceased range in age from 26 to 82.”We’re not giving up hope. We’re there every day,” Rachel Spiegel, whose mother Judy Spiegel is missing, told CNN’s Don Lemon on Monday. A six-person team of federal officials from the National Institute of Standards and Technology — consisting of scientists, structural engineers and a geotechnical engineer — is conducting a preliminary investigation of the collapsed building’s materials, history and applicable building codes at the time the condo was built, the ground surrounding the building and numerous other factors, according to an agency official.The latest on the partial building collapse near MiamiThe latest on the partial building collapse near MiamiThe latest on the partial building collapse near MiamiAs investigators converge on the scene, questions are being asked about the building’s structural integrity.Read More A 2018 report from an engineering firm documented severe structural damage to the concrete slab below the pool deck and “cracking and spalling” located in the parking garage. Spalling is a term used to describe areas of concrete that have cracked or crumbled.And an April 2021 letter from the condo’s board president to residents said some damage observed the 2018 report, such as in the garage, “has gotten significantly worse.””The concrete deterioration is accelerating. The roof situation got much worse, so extensive roof repairs had to be incorporated,” the letter from board President Jean Wodnicki reads.Wodnicki further described issues facing the building: “When you can visually see the concrete spalling (cracking), that means that the rebar holding it together is rusting and deteriorating beneath the surface.”CNN has reached out to representatives of the condominium association for further comment.The 2021 letter sought to explain a $15 million assessment that condo owners were to pay for repairs to the building, with payments set to begin July 1. The association approved the assessment in April to complete repairs required under the county’s 40-year recertification process, according to documents obtained by CNN.Building residents also had raised concerns over tremors during construction of a nearby building in 2019, according to documents obtained by CNN and interviews with the family members of people missing in the collapse. The 2018 report didn’t say whether the structure was at risk of collapse. Donna DiMaggio Berger, an attorney for the condominium board, told CNN’s Chris Cuomo on Monday that she didn’t think the building was in a state of disrepair prior to its collapse.”We have months and years to dig into what happened, and we’re going to. The board is already in the process of hiring an engineer to also try to figure out what happened, and they will be evaluating who’s responsible.”People join together in a community twilight vigil on the beach for those lost and missing during the partially collapsed Champlain Towers South condo building Monday.People join together in a community twilight vigil on the beach for those lost and missing during the partially collapsed Champlain Towers South condo building Monday.People join together in a community twilight vigil on the beach for those lost and missing during the partially collapsed Champlain Towers South condo building Monday.The investigation will take monthsWhile there are no clear answers on the cause, early signs point to some failure in the lower reaches of the 13-story building, perhaps in its foundation, columns or underground parking garage, according to experts.Forensic engineers will need to examine the ground-floor columns in their investigation, Sinisa Kolar, a Miami-based engineering executive, told CNN.He said that samples of concrete will need to be tested to examine the condition and then those samples will need to be cross-referenced with structural drawings.Leo Souto adds flowers to a memorial featuring photos of some of those lost in the partially collapsed building on June 28, in Surfside, Florida. Leo Souto adds flowers to a memorial featuring photos of some of those lost in the partially collapsed building on June 28, in Surfside, Florida. Photos: Deadly condo collapse near MiamiLeo Souto adds flowers to a memorial featuring photos of some of those lost in the partially collapsed building on June 28, in Surfside, Florida. Hide Caption 1 of 44People join a community twilight vigil on the beach for those lost and missing on June 28.People join a community twilight vigil on the beach for those lost and missing on June 28. Photos: Deadly condo collapse near MiamiPeople join a community twilight vigil on the beach for those lost and missing on June 28.Hide Caption 2 of 44Search and Rescue teams look for possible survivors on June 28.Search and Rescue teams look for possible survivors on June 28. Photos: Deadly condo collapse near MiamiSearch and Rescue teams look for possible survivors on June 28.Hide Caption 3 of 44Members of the Legendarios, a men's religious group, gather for a moment of prayer Saturday, June 26, at the site of the partially collapsed building in Surfside, Florida.Members of the Legendarios, a men's religious group, gather for a moment of prayer Saturday, June 26, at the site of the partially collapsed building in Surfside, Florida. Photos: Deadly condo collapse near MiamiMembers of the Legendarios, a men’s religious group, gather for a moment of prayer Saturday, June 26, at the site of the partially collapsed building in Surfside, Florida.Hide Caption 4 of 44A woman puts flowers in a barricade as she pays her respects near the building.A woman puts flowers in a barricade as she pays her respects near the building. Photos: Deadly condo collapse near MiamiA woman puts flowers in a barricade as she pays her respects near the building.Hide Caption 5 of 44Search-and-rescue workers look for possible survivors on Sunday.Search-and-rescue workers look for possible survivors on Sunday. Photos: Deadly condo collapse near MiamiSearch-and-rescue workers look for possible survivors on Sunday.Hide Caption 6 of 44Passersby look at photos of missing people.Passersby look at photos of missing people. Photos: Deadly condo collapse near MiamiPassersby look at photos of missing people.Hide Caption 7 of 44Workers search through the rubble on Saturday.Workers search through the rubble on Saturday. Photos: Deadly condo collapse near MiamiWorkers search through the rubble on Saturday.Hide Caption 8 of 44Eliagne Sanchez and K. Parker lay flowers on the beach near the partially collapsed building.Eliagne Sanchez and K. Parker lay flowers on the beach near the partially collapsed building. Photos: Deadly condo collapse near MiamiEliagne Sanchez and K. Parker lay flowers on the beach near the partially collapsed building.Hide Caption 9 of 44Smoke rises as rescuers continued to search for survivors on Saturday.Smoke rises as rescuers continued to search for survivors on Saturday. Photos: Deadly condo collapse near MiamiSmoke rises as rescuers continued to search for survivors on Saturday.Hide Caption 10 of 44People stand near the building on Friday.People stand near the building on Friday. Photos: Deadly condo collapse near MiamiPeople stand near the building on Friday.Hide Caption 11 of 44Mourners light candles on the beach near the building on Friday.Mourners light candles on the beach near the building on Friday. Photos: Deadly condo collapse near MiamiMourners light candles on the beach near the building on Friday.Hide Caption 12 of 44Members of a search-and-rescue team work in the rubble.Members of a search-and-rescue team work in the rubble. Photos: Deadly condo collapse near MiamiMembers of a search-and-rescue team work in the rubble.Hide Caption 13 of 44Leo Soto sets up a memorial site with photos of missing people from the complex. One of the missing people is his friend Nicole Langsfield.Leo Soto sets up a memorial site with photos of missing people from the complex. One of the missing people is his friend Nicole Langsfield. Photos: Deadly condo collapse near MiamiLeo Soto sets up a memorial site with photos of missing people from the complex. One of the missing people is his friend Nicole Langsfield.Hide Caption 14 of 44Firefighters battle a blaze at the collapse site.Firefighters battle a blaze at the collapse site. Photos: Deadly condo collapse near MiamiFirefighters battle a blaze at the collapse site.Hide Caption 15 of 44People pray together on the beach near the collapsed building.People pray together on the beach near the collapsed building. Photos: Deadly condo collapse near MiamiPeople pray together on the beach near the collapsed building.Hide Caption 16 of 44People hug Friday as they wait for news about their relatives at a community center in Surfside.People hug Friday as they wait for news about their relatives at a community center in Surfside. Photos: Deadly condo collapse near MiamiPeople hug Friday as they wait for news about their relatives at a community center in Surfside.Hide Caption 17 of 44Rescue personnel search through the building's rubble on Friday.Rescue personnel search through the building's rubble on Friday. Photos: Deadly condo collapse near MiamiRescue personnel search through the building’s rubble on Friday.Hide Caption 18 of 44Toby Fried holds up a picture of her missing brother, Chaim Rosenberg, outside the Surfside Community Center on Friday.Toby Fried holds up a picture of her missing brother, Chaim Rosenberg, outside the Surfside Community Center on Friday. Photos: Deadly condo collapse near MiamiToby Fried holds up a picture of her missing brother, Chaim Rosenberg, outside the Surfside Community Center on Friday.Hide Caption 19 of 44Rescue workers use a crane to inspect the damage on Friday.Rescue workers use a crane to inspect the damage on Friday. Photos: Deadly condo collapse near MiamiRescue workers use a crane to inspect the damage on Friday.Hide Caption 20 of 44Ariana Hevia, center, stands with Sean Wilt near the partially collapsed building on Friday. Hevia's mother, Cassandra Statton, lives in the building.Ariana Hevia, center, stands with Sean Wilt near the partially collapsed building on Friday. Hevia's mother, Cassandra Statton, lives in the building. Photos: Deadly condo collapse near MiamiAriana Hevia, center, stands with Sean Wilt near the partially collapsed building on Friday. Hevia’s mother, Cassandra Statton, lives in the building.Hide Caption 21 of 44Rescue workers arrive to the scene with dogs on Friday.Rescue workers arrive to the scene with dogs on Friday. Photos: Deadly condo collapse near MiamiRescue workers arrive to the scene with dogs on Friday.Hide Caption 22 of 44People observe the building from the nearby beach.People observe the building from the nearby beach. Photos: Deadly condo collapse near MiamiPeople observe the building from the nearby beach.Hide Caption 23 of 44Faydah Bushnaq, center, is hugged by Maria Fernanda Martinez as they stand on the beach near the building. Bushnaq, who was vacationing in South Florida, stopped to write "pray for their souls" in the sand.Faydah Bushnaq, center, is hugged by Maria Fernanda Martinez as they stand on the beach near the building. Bushnaq, who was vacationing in South Florida, stopped to write "pray for their souls" in the sand. Photos: Deadly condo collapse near MiamiFaydah Bushnaq, center, is hugged by Maria Fernanda Martinez as they stand on the beach near the building. Bushnaq, who was vacationing in South Florida, stopped to write “pray for their souls” in the sand.Hide Caption 24 of 44The arm of an earth mover is seen during the search operations.The arm of an earth mover is seen during the search operations. Photos: Deadly condo collapse near MiamiThe arm of an earth mover is seen during the search operations.Hide Caption 25 of 44Rescue personnel work at the site on Thursday.Rescue personnel work at the site on Thursday. Photos: Deadly condo collapse near MiamiRescue personnel work at the site on Thursday.Hide Caption 26 of 44Yube Pettingill talks to the media. Two of her family members were still missing.Yube Pettingill talks to the media. Two of her family members were still missing. Photos: Deadly condo collapse near MiamiYube Pettingill talks to the media. Two of her family members were still missing.Hide Caption 27 of 44This photo was tweeted by Miami-Dade Fire Rescue after the building collapsed on Thursday.This photo was tweeted by Miami-Dade Fire Rescue after the building collapsed on Thursday. Photos: Deadly condo collapse near MiamiThis photo was tweeted by Miami-Dade Fire Rescue after the building collapsed on Thursday.Hide Caption 28 of 44Displaced residents are taken to a nearby hotel in Surfside.Displaced residents are taken to a nearby hotel in Surfside. Photos: Deadly condo collapse near MiamiDisplaced residents are taken to a nearby hotel in Surfside.Hide Caption 29 of 44The partial collapse left huge piles of rubble and materials dangling from what remained of the structure.The partial collapse left huge piles of rubble and materials dangling from what remained of the structure. Photos: Deadly condo collapse near MiamiThe partial collapse left huge piles of rubble and materials dangling from what remained of the structure.Hide Caption 30 of 44Firefighters use a ladder hose as smoke comes out of the rubble on Thursday.Firefighters use a ladder hose as smoke comes out of the rubble on Thursday. Photos: Deadly condo collapse near MiamiFirefighters use a ladder hose as smoke comes out of the rubble on Thursday.Hide Caption 31 of 44Florida Gov. Ron DeSantis, at center in the red tie, arrives to speak to the media on Thursday. "We still have hope to be able to identify additional survivors," DeSantis told reporters near the scene. "The state of Florida, we're offering any assistance that we can."Florida Gov. Ron DeSantis, at center in the red tie, arrives to speak to the media on Thursday. "We still have hope to be able to identify additional survivors," DeSantis told reporters near the scene. "The state of Florida, we're offering any assistance that we can." Photos: Deadly condo collapse near MiamiFlorida Gov. Ron DeSantis, at center in the red tie, arrives to speak to the media on Thursday. “We still have hope to be able to identify additional survivors,” DeSantis told reporters near the scene. “The state of Florida, we’re offering any assistance that we can.”Hide Caption 32 of 44Debris dangles from the building on Thursday.Debris dangles from the building on Thursday. Photos: Deadly condo collapse near MiamiDebris dangles from the building on Thursday.Hide Caption 33 of 44People hug at a family reunification center where evacuees were staying in Surfside.People hug at a family reunification center where evacuees were staying in Surfside. Photos: Deadly condo collapse near MiamiPeople hug at a family reunification center where evacuees were staying in Surfside.Hide Caption 34 of 44The cause of the collapse wasn't immediately known.The cause of the collapse wasn't immediately known. Photos: Deadly condo collapse near MiamiThe cause of the collapse wasn’t immediately known.Hide Caption 35 of 44Jennifer Carr sits with her daughter as they and other evacuees wait for news at the family reunification center in Surfside.Jennifer Carr sits with her daughter as they and other evacuees wait for news at the family reunification center in Surfside. Photos: Deadly condo collapse near MiamiJennifer Carr sits with her daughter as they and other evacuees wait for news at the family reunification center in Surfside.Hide Caption 36 of 44Rescue personnel search through the rubble with dogs on Thursday.Rescue personnel search through the rubble with dogs on Thursday. Photos: Deadly condo collapse near MiamiRescue personnel search through the rubble with dogs on Thursday.Hide Caption 37 of 44Police stand guard near the scene on Thursday.Police stand guard near the scene on Thursday. Photos: Deadly condo collapse near MiamiPolice stand guard near the scene on Thursday.Hide Caption 38 of 44People on the beach look at the building after the partial collapse.People on the beach look at the building after the partial collapse. Photos: Deadly condo collapse near MiamiPeople on the beach look at the building after the partial collapse.Hide Caption 39 of 44The building was constructed in 1981, according to online Miami-Dade property records.The building was constructed in 1981, according to online Miami-Dade property records. Photos: Deadly condo collapse near MiamiThe building was constructed in 1981, according to online Miami-Dade property records.Hide Caption 40 of 44People lie on cots at the family reunification center in Surfside.People lie on cots at the family reunification center in Surfside. Photos: Deadly condo collapse near MiamiPeople lie on cots at the family reunification center in Surfside.Hide Caption 41 of 44The beachfront community is a few miles north of Miami Beach.The beachfront community is a few miles north of Miami Beach. Photos: Deadly condo collapse near MiamiThe beachfront community is a few miles north of Miami Beach.Hide Caption 42 of 44More than 80 rescue units responded to the scene, Miami-Dade Fire Rescue said.More than 80 rescue units responded to the scene, Miami-Dade Fire Rescue said. Photos: Deadly condo collapse near MiamiMore than 80 rescue units responded to the scene, Miami-Dade Fire Rescue said.Hide Caption 43 of 44Rescue personnel work at the site of the partial collapse.Rescue personnel work at the site of the partial collapse. Photos: Deadly condo collapse near MiamiRescue personnel work at the site of the partial collapse.Hide Caption 44 of 4402 surfside collapse 062803 surfside collapse 062801 surfside collapse 062803b surfside building collapse 062802 surfside building collapse 062801 surfside building collapse 062811 miami building collapse 062602 seaside collapse 062701 seaside collapse 0627 RESTRICTED10 miami building collapse 062608b building collapse gallery 062512 miami building collapse 062510 building collapse gallery 0625 RESTRICTED11 building collapse gallery 062512 building collapse gallery 062513 building collapse gallery 062501 building collapse gallery 0626 10 miami building collapse 062503 building collapse gallery 0626 04 building collapse gallery 0626 05 building collapse gallery 0626 06 building collapse gallery 0626 07 building collapse gallery 0626 35a miami building collapse 062534 miami building collapse 062527 miami building collapse 062429 miami building collapse 062416 miami building collapse 062431 miami building collapse 062417 miami building collapse 062418 miami building collapse 062419 miami building collapse 062420 miami building collapse 062421 miami building collapse 062410 florida building collapse 21062414 florida building collapse 21062413 florida building collapse 21062401 florida building collapse 21062428 miami building collapse 062412 florida building collapse 21062415 florida building collapse 21062404 florida building collapse 21062402 florida building collapse 21062409 florida building collapse 210624“The key element to this investigation, in my opinion, lies in that rubble, in those columns and condition of the structural elements,” Kolar said.The investigation could take months or longer, according to Allyn Kilsheimer, the structural engineer hired by the town of Surfside. He has started to examine the building and will use a meticulous, computer-assisted process of elimination to attempt to identify the cause or causes, he said.”Unless it’s a plane or a bomb that you know triggered this whole thing, sometimes you can’t get it down to one cause,” he said. “You don’t know what you’re going to end up with until you finish the whole study.”A pool contractor who was servicing the condo pool 36 hours before its collapse told the Miami Herald he had seen standing water and cracks in concrete underneath the pool deck.Condo owners in Surfside building were facing assessments for $15 million worth of repairsCondo owners in Surfside building were facing assessments for $15 million worth of repairsCondo owners in Surfside building were facing assessments for $15 million worth of repairsWhen he first entered the building, the pool area and upper lobby looked fine, but when he walked into the basement garage under the pool deck, he claims he saw lots of standing water and claims to have found cracks in the concrete in the pool equipment room, according to Miami Herald reporter Sarah Blaskey.”He took a picture of that concrete to send to his boss, because he was there to do a little bit of cosmetic stuff to the pool, but he thought, ‘Wow, this is going to be a bigger job,’ took a picture, sent it to his boss,” Blaskey told CNN. She noted that the photos were reportedly taken in the equipment room on south side of the basement structure, rather than the north side, where the structure caved. Families and friends are waiting for answersMeanwhile, at least 11 victims have been identified. They are Stacie Fang, 54, Antonio Lozano, 82, Gladys Lozano, 80, Manuel LaFont, 54, Leon Oliwkowicz, 80, Luis Bermudez, 26, Anna Ortiz, 46, Christina Beatriz Elvira, 74, Marcus Joseph Guara, 52, Frank Kleiman, 55 and Michael David Altman, 50.Family members of those still missing are waiting for any answers they can get as the search continues. A person adds flowers Monday to a memorial that has pictures of some of the missing from the partially collapsed Champlain Towers South condo building in Surfside.A person adds flowers Monday to a memorial that has pictures of some of the missing from the partially collapsed Champlain Towers South condo building in Surfside.A person adds flowers Monday to a memorial that has pictures of some of the missing from the partially collapsed Champlain Towers South condo building in Surfside.”I have 100% faith in a lot that’s going on here,” Kevin Spiegel, the husband of Judy Spiegel, told CNN’s Wolf Blitzer. “Honestly, I think we all want more information.”Their daughter Rachel told CNN’s Don Lemon she’s nervous about the fires from the collapse and how the heat and smoke may be impacting rescue efforts. “I’m very worried,” she said.However, she told CNN she was very optimistic about the expert teams from abroad that have come to help with the rescue attempt. “There are so many teams from other countries coming in and coming to help us, which is fantastic.” Ronit Felszer and Carlos Naibryf told CNN’s Alisyn Camerota on Monday that they are being realistic about the possible outcome.Carlos Naibryf said his son “was a 21-year-old young adult. Bright. Everywhere he went, he made an impact … now he’s at U. Chicago, physics major.” When Camerota asked the parents if they’re still believing in a miracle, Felszer shook her head. “We want to believe in a miracle because we still don’t have the physical presence, in part or in whole, of our son,” she said. “A miracle can come, yes, but we have to be very realistic,” the father told CNN.Rescue conditions remain dangerousWhile families grieve and hope and officials investigate, the mayor of Surfside said the primary focus is to get victims out of the debris. “The number one priority here is pulling these people out of the rubble and we’re going to focus only on that. The second priority is supporting the families,” Charles Burkett told CNN’s John Berman on Monday night.Miami Dade Fire Chief Alan Cominsky said the search efforts are “a slow process, but we’re definitely making progress.” Rescuers are working 12-hour shifts and efforts have continued non-stop since the collapse early Thursday morning.How to help Surfside building collapse victimsHow to help Surfside building collapse victimsHow to help Surfside building collapse victims“These men and women aren’t pausing,” Florida CFO and state Fire Marshal Jimmy Patronis said. “They continue to have a type of momentum and motivation that is really, really inspiringVictims have been found in different areas as the teams search through various search grids, rather than one isolated area, according to Cominsky.While rescuers were impeded by weather conditions and smoke conditions earlier in the week, conditions have improved but remain dangerous in the search area.”There’s definitely a concern with the rain, and now the debris, and possibly sliding — so I mean it’s an extremely dangerous situation,” he said. “It’s a very, very difficult, very, very challenging situation, and you know we’re doing the best that we can, what we’re trained to do and will definitely continue moving forward.

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