A Caisson
Jacques Digout has written: 'Application des memoires optiques en gestion d'enterprise'
about 34 if you look evey where but you will have to digout your hole world
Depends on the earth surrounding it. If in Florida, where the water table is within a couple feet of the ground, answer is no, not unless you want to go to the expense of having a well point system setup running for a week or so it takes to do the job. Elsewhere, maybe. Behind the vinyl liner is a galvanized metal wall. Floor is probably sand. Liner comes out, walls come out, some more digout would probaby be needed (dirt behind walls of pools cannot be sluffing into the hole while work progresses) Then installation of 3/8 steel mesh for bottom and walls, placement of piping and niches, application of gunnite, finishing, tile installation, and finally plastering for a nice white finish. Sorta reminds one of building a pool from scratch in many ways.