The first combat submarine to sink a warship also simultaneously sank itself.
A British Navy Stoker managed to escape from a sinking submarine and get to the surface over a 100 feet up. He then swam five miles to land.
In 2009 two nuclear submarines (French and British) collided into one another in the Atlantic… because they couldn’t detect one another.
On July 6, 1967, the Alvin Submersible was attacked by a swordfish, which became lodged in the skin of the sub. The crew made an emergency surface, recovered the fish, and ate it for dinner.