A submarine can operate under water while other ships cannot, and a submarine can surface after going under water, while other ships can't.
If everything is working correctly, a submarine can surface after sinking, while other ships cannot.
The primary advantage a submarine has over other ships is its ability to submerge and hide.
Modern Submarines do not have a keel like other ships....
A submarine is to spy on ship movements and if necessary sink ships
Enemy surface ships are the main target of submarine warfare
The formation of several ships intended to provide protection against submarine attack was called a wolf-pack.
· submarine
it referred to sinking ships
A periscope is used to observe the surface from a submarine
Submarines have a rudder like most surface ships.
. . . submarine attacks upon merchant ships .
carrier, battleship, cruiser, destroyer, submarine
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