That sonar dome did some really strange things to forward berthing compartments underway. (I think the only thing forward of us was the boatswain's locker.)
When it popped out of the water, there was a huge jump up, then it acted like a parachute on the way back down. Of course, as soon as it hit the water again, it dug back in for a quick jerk down. Real fun trying to sleep in the north Atlantic. :=)