Why torpedo-room weight is more than its machinery

How much weight did the torpedo rooms add to the Queen Elizabeth-class battleships?

A simple machinery total is misleading because the rooms also displaced other systems and shaped the surrounding hull layout; answering properly requires a full redesign comparison.

The torpedo machinery and room structure provide only the visible part of the calculation. Their location determines where other systems can go and what alternative use the enclosed volume might have had. A meaningful answer must compare the whole ship with a torpedo-free redesign rather than subtracting one catalogued weight.