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How can a submarine hang in water?

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Anonymous

15y ago
Updated: 8/17/2019

The submarine term for the maneuver is called "hovering". The 2 primary situations in which hovering is utilized is in preparation for an under-ice surfacing, and for Ballistic Missile submarines, in order to launch their missiles.

Before a submarine empties its ballast tanks of air to submerge, the crew already knows how much fixed and variable ballast weight to account for, so that enough Trim Tank water ballast can be pumped aboard to achieve a state of Neutral Buoyancy upon submerging. Neutral Buoyancy is that state in which a submarine (or in Scuba, a diver) is neither sinking or rising, effectively 'hanging" in the water. With divers, as they change depth, they add or release air from their buoyancy compensators (BC's) to maintain NB as the change in pressure affects the state of buoyancy. Submarines accomplish the same thing by pumping in or pumping out seawater to and from the boat's Trim Tanks as the boat changes from one depth to another. Trim tanks are used for boat leveling (Fore and Aft, Port and Starboard), as well as Variable Ballast control.

In a true state of Hovering, the boat has come to a full stop, and has achieved a state of NB. For under-ice surfacing, water is pumped out of the Trim Tanks just enough to create positive buoyancy until the sail contacts the ice. Positive buoyancy is then increased to the point where the boat eventually breaks through the ice.

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15y ago

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