Ahhh Kowalski. That guy had a skull made of hardened steel. It seems like every week he was being smashed on the back of the head with a giant wrench.
Skull fractures? Brain bleeds? Concussions? Traumatic Brain Injury?
Not for ole Kowalski. Back to work by the end of the episode with the mandatory white bandage around his head.
He used to be a red shirt on Star Trek!!!;-)
In one of the early episodes, the submarine had sunk and tilted on its side. In order to allow docking with the rescue vehicle, it had to be righted. A sailor volunteered to seal himself into a closed room and open a valve, thus filling the room with seawater and ensuring that he would drown, but altering the weight balance of the submarine enough to solve the tilting problem. This scene was very disturbing for a kid.
On reflection, it is not clear why it was not possible for the sailor to quickly leave the room after the valve had been opened. And also where all the air in the room would go.