A few days ago the Russian Federation troops flooded decommissioned large anti-submarine ship "Ochakov" in order to block the exit of several Ukrainian courts Donuzlav lake in Crimea. Such actions in the history of the world fleet is not uncommon, so I suggest you learn a few very curious stories flooding warships.

During the military exercises in the Pacific Ocean, an Australian submarine sank the old American ship. Have a new modification of the torpedo, which proved to be excellent.
Now you know how the torpedo attack and that it entails.