Why hit location matters to the Pugliese torpedo-defence system

How effective was the Italian Pugliese torpedo-defence system?

It could work well when hit in its protected area, but effectiveness depended heavily on where and under what conditions the torpedo struck.

The Italian Pugliese torpedo-defence system was an interesting design capable of working well. Its performance depended on the weapon striking where the protective structure was designed to absorb the explosion. A scheme arranged for combat maneuvering cannot be assumed to cover every harbor or oblique hit equally. Littorio already had a strong system, though knowledge of the G3 arrangement might have suggested additional ideas rather than an obviously superior wholesale replacement.