Battleships, during their heyday, had an unfortunate tendency to randomly blow up in port. This was almost always down to poor powder handling or just unstable powder, in general. A couple exceptions from brave frogmen aside.

The Japanese battleship, Mutsu, is probably the most infamous of them all. Generally assumed to be a suicidal crewman lighting a fatal fire, we don't really know for sure. And never will.

It's a shame that this is all she's remembered for, but not terribly surprising, in that regard.

Further Reading:
https://www.amazon.com/Conways-Worlds-Fighting-Ships-1922-1946/dp/0831703032/
https://www.amazon.com/Warships-Imperial-Japanese-Navy-1869-1945/dp/087021893X/
https://www.amazon.com/Imperial-Japanese-Battleships-1941-45-Vanguard/dp/1846032806/
http://www.combinedfleet.com/Mutsu.htm


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