You are correct. It takes a full Boomer crew to launch a bird. Everyone knows on board, and its an all hands exercise. When its launched, EVERYONE feels it. It shoves the boat down a few feet deeper into the water its that big a thrust.
NO ONE misses a launch, and it never happens on accident. There is a strict protocol. If one ever lit on accident, it would take the boat to the bottom. It would not launch itself. Too many things have to deliberately put into action at the right time or it does not happen.