As the search for survivors continues, slotxo questions are being raised about what caused a 12 storey apartment complex to collapse in Surfside, near Miami in Florida. Experts gathering information at the scene will have to consider a range of possible causes - from structural defects to environmental influences - and whether a combination of factors may have triggered the sudden collapse of the 40-year-old block. What does the video show? Video footage taken by a surveillance camera mounted on a neighbouring condominium shows that the building did not fall at once, but rather fell in stages. First, the south-facing central section collapsed, before the north-facing central section followed just three seconds later. Five seconds after that, the east-facing section crumbled. Some experts who have viewed the footage believe that the initial collapse was at the base of the building, around the pool area in front of the south-facing central section. What were the issues raised in the 2018 inspection? The 2018 inspection highlighted "a major error" in the original design of the apartment block. The engineer, Frank Morabito, warned that the ground floor pool deck was not sloped to drain, so any water "sits on the waterproofing until it evaporates". The report said the waterproofing below the ground floor pool deck and decorative planters was "beyond its useful life" and causing "major structural damage to the concrete structural slab below these areas". Failure to replace the waterproofing in the near future would, it said, cause the extent of the concrete deterioration to "expand exponentially".