Quote:
Originally Posted by Sailor Steve
The pressure is on all sides of the boat, pushing down, inwards, and UP. In fact the bottom of the boat is deeper and under more pressure, therefore the tendency is to rise, like a balloon. It must be trimmed in order to maintain depth. The reason a boat underwater tends to sink is that the boat leaks, which increases the internal weight of the boat, requiring constant retrimming.
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Thanks Sailor Steve, answers my question. 
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I'm a gas pumpen, tire and brake changin, fix anything, jet fuel drinken, USAF Crew Chief.
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