Gong: vibrations break glass, water flows (shoots) out into the water room (marked ‘w’) bringing with it some shards of its crystal container (clue for players to know what happened.) The water drains away in a hole in the ground and fills another container to raise the counterweight. This unlocks the doors from the water room (marked 'w') to the tomb (big blue room in the middle). (You effectively need four people to open this lock)
