The noise was from the various systems that operate the legs and gyros to maintain balance, so it's only generated when it's in a mode for actively traversing t

The noise was from the various systems that operate the legs and gyros to maintain balance, so it's only generated when it's in a mode for actively traversing terrain. If it's in "peek" mode, it would probably be pretty quiet. Regardless, I don't think one cares too much about noise in the trench. Maybe they do, never fought in one.