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Things. waterproofing only has a useful life and after a period of time, you have to replace it. the north building, i think, last year or the year before, replaced all the waterproofing. the issue is when water gets into a crack, all concrete cracks, it's made to crack. water gets into a crack. in the north, you worry about it freezing and thawing, because when water freezes, it expands and that makes the crack bigger. then you can get rust in the reinforcement steel. when rust gets in the reinforcement steel, at first glance it might look severe, but remember, it's an expanded material. you ...

Water in that area. >> you know, i read the report. and the water is very, very concerning. and in the report, there is actually a sentence that states that, maybe, this event is actually in other locations in the building. so for example, if the waterproofing has failed where the pool deck is. has the waterproofing, also, failed where the roof is? what happens then is the connections, over time, fail. and this event did not happen, in the past-24 hours or the past-24 months. it -- it took time to be done. and nobody was working on the building in the middle of the night. so, if the event real...

Found odd and concerning. he asked the employee what it was about at the time and the employee said it was probably a waterproofing issue that was going to be fixed. then he was led over to the south side underneath the pool area still in the garage to where the pool equipment room was and inside that room he saw major concrete spaling, exposed rebar in one of the beams there. he found it alarming enough he snapped photos and sent them to his boss at the time to say, you know, this project might actually cost a little more than we initially thought. that particular area was actually not what c...

Of those towers. >> reporter: but while engineers continue to speculate from afar, but reality the answer likes, like the victims, trapped under rubble. an alarming 2018 inspection report warned of abundant cracking in concrete columns and several instances of deteriorating rebar, especially on the condo's pool deck and in the parking structure garage underneath the building. according to the report, failed waterproofing was causing major structural damage to the concrete structural slabs below the pool. several engineers cnn spoke with say the 2018 report did not foresee a catastrophic collap...

Unusual amount of standing water in that area? >> you know, i read the report and the water is very, very concerning, and in the report is a sentence that states that maybe this event is actually in other locations in the building. for example, if the waterproofing has failed where the pool deck is, has the waterproofing also failed where the roof? what happens then is, were there connections over time that failed? in this event it did not happen in the past 24 hours or the past 24 months. it took time to be done, and nobody was working on the building in the middle of the night. so if the eve...