Undercut cell

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As negative buoyancy cells specific to ballast tanks of a submarine called, used for quick diving the boat. They are usually below the center of gravity of the submarine.

The task of the underdrive cells was to increase the weight of the submarine as quickly as possible in order to achieve faster alarm diving times than with the normal diving cells that were also built in. The alarm dive times for combat boats in World War II were sometimes less than 30 seconds. If the submarine moves on the surface of the water, the subsurface cells are filled with air. When the submarine is fully submerged after an alarm dive, the subsurface cells are squeezed out (drained). Since they could not be exposed to great water pressure and so that the submarine did not sag too quickly, they had to be blown on again after the boat disappeared below the surface of the water.

This technology is no longer used in modern nuclear submarines , as they usually only have to dive once during their use and only reappear after months. Therefore, they sometimes need several minutes to dive.

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