After what happened to H.M.S. Hood I firmly agree with those who talk of a lucky shot, and wonder about the Bismark's 'excellent' fire control..short comings there may have had her clobbered by a Swordfish The Hood was sunk because it's commander Admiral Holland had to run a dangerous stage in his otherwise perfect approach to engage the Bismark....a single salvo found it's mark during a window of opportunity.
Hood was a battlecruiser going up against a battleship. No contest. Hood had no adequate armor protection against plunging shellfire.