How German torpedo failure saved Warspite in Norway

How vulnerable was Warspite while operating in a Norwegian fjord?

Extremely vulnerable; working German torpedoes might have hit her five or six times and sunk her.

The ship's survival can make the Norwegian operation appear safer in hindsight than it was. German submarines obtained firing opportunities, but their torpedoes did not work as intended. Effective weapons might have produced five or six hits. That weight of underwater damage could sink even a battleship, making weapons reliability rather than invulnerability the decisive factor.