In a message dated 7/15/2007 3:53:23 PM Central Daylight Time, akula151@yahoo.com writes:
The idea is to have the sub ballasted negatively and use gravity as the propulsion source. At max depth (depending upon how much I have seeen documentaries a while ago with small research vehicles (unmanned)
that functioned exactly this way. Forget who was doing it but they had
multiple vehicles and were actually in use.
I do remember they had a long range and pretty deep
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