Took a tour on the last Diesel sub made in USA. Went to the engine room with Me Dad, (who is not in the least mechanically inclined). Found the valves controlling the diving planes. Tried to move one and it moved easily, caught a glance at the bottom and seen it had been disconnected. Said "Hey Dad, look at this," quickly pulled the lever back, and Dad just about ruined His undies. Wife thinks I am incurably onery, I am not sure as there is more where that came from.