How many modern torpedoes might sink a Queen Elizabeth-class battleship

How many modern torpedo hits would it take to sink a Queen Elizabeth-class battleship?

One would do serious damage, two might sink her, and three would make the loss much more certain, depending on hit location and damage control.

No single number guarantees the outcome. One hit could inflict major damage without necessarily sinking the battleship. Two hits might start an uncontrollable loss, while a well-run crew could still survive depending on where the explosions occurred. Three hits make a sinking much more certain, with damage control and hit location preventing a simple arithmetic rule.