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Rating: cute

The USS Connecticut (SSN-22) is a seawolf-class nuclear powered fast attack submarine that is operated by the United States navy. It is able to break through the thick sea-ice of the Arctic ocean with its reinforced sail. Breaking through, however, still requires an unconventional technique known as a vertical surfacing. The sub has to be brought to a standstill before it can move in a vertical line upwards, smashing through the thick ice. In order to do this the sub will rapidly increase her own buoyancy to achieve enough momentum to actually break the ice.

Nuclear submarines can pass under the sea-ice of the Arctic ocean. The ice conceals them from aircraft, but also provides new challenges to submarines. Sound is far more amplified under the ice, and a vessel cannot simply surface if anything goes wrong mechanically.

Reference:

Woody, C. (2020, June 11). How US Navy submarines carefully smash their way through Arctic ice. Business Insider. https://www.businessinsider.com/how-navy-submarines-carefully-smash-surface-through-arctic-ice-2020-6  

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Important notice

A submarine is a military vessel.

A submersible is the proper term for a civilian vessel that has similar abilities to a submarine.

It is similar to the difference between the Russian terms Aerodrom and Aeroport, which designate a military and civilian airport respectively.