“Probably concrete pilings hammered in. Betcha when all is said and done and they pull these out the will see saltwater eroded concrete and re-bar. Salt water raises hell with concrete “
True, but in this case, it was the pool that was leaking into the parking below, because its seal wasn’t maintained.
It was the pool deck aka entire patio around the pool. It was not properly sloped and the water pooled up causing seepage through the slab and on the ocean that included salt.
Concrete and rebar dont like salt