The problem, however, tends to be that the theory just doesn't hold the truth.
Drainage - Water needs to drain out of the pool to avoid standing water or dirt and mud getting into the pool. Over your lifetime the sediment built by way of the bottom so now divers are lucky to discover 55-feet. https://near-finder-Australia.com/en/business/wa/henderson/diving-services/franmarine-underwater-services_2547345+4.html