Admiral Lütjens and the “Bismarck”

And the Tirpitz (Bismarck’s sister ship) directly sank even less (0 ships).

Indirectly, it caused problems with a convoy (PQ-17) that had many ships sunk just because it threatened to sail.

The all time worst Battleship cost to performance would be the Japanese battleship (Musashi). However, at least half her crew survived