Sail (submarine)

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Sail of the French nuclear submarine Casabianca; note the diving planes, camouflaged masts, periscope, electronic warfare masts, door and windows.
Sail of the French nuclear submarine Casabianca; note the diving planes, camouflaged masts, periscope, electronic warfare masts, door and windows.

In naval parlance, the sail or fin of a submarine is the tower-like structure found on the dorsal (topside) surface of submarines. Submarine sails usually house the conning tower (command and communications data center), the periscope(s), radar and communications masts (antennae). When surfaced, the sail serves as an observation platform.

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