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It depends on how deep it is. If it is 6 inches deep, you will need 77 yards.
they need to know how long they can be underwater, and how deep they can go with the air in the tank.
It depends on how deep the concrete. 600 sq ft at 6 inch deep is 300 cu ft = 11.1 yards. 12 inch deep is 22,2 yards; 4 inch deep is 5.5 yards
You need 82/3 [cubic] yards for every foot deep that it has to be.
if that is 3 ft deep it would require 96 yards... IF it is 3 inches deep it would require 24 cubic yards