At Mercury, the Ohio Players enjoyed their greatest success; not only did their sound coalesce, but they became notorious for their sexually provocative LP covers, a tradition begun during their Westbound tenure.
Objects float when the volume of water they displace is less than the volume of the objects themselves. When objects sink, the volume of water they displace is greater than the volume of the object. The principle may seem relatively simple: Light objects float and heavy objects sink.
When a boat (the submarine sailor's term for his vessel) is submerged, the whole volume of the vessel displaces a like volume of water. This is true, except that the main ballast tanks are full of water; they have no air in them. The submarine is set up to be neutrally buoyant when it's under water.