As the series proceeded, Admiral Nelson became more and more condescending in response to most of the non-commissioned officers' questions and comments, especially Chief Sharkey. It was considered natural as part of the dialog for the genius senior officer to be short tempered and sarcastic to the enlisted crew, not as much to the officers, and never to Captain Crane. The crew of the Seaview never talked back to the Admiral no matter how unnecessarily caustic he got responding to their considered stupid questions.
This episode takes place in the 1980s.
The footage of the Seaview breaking the water's surface was used to produced the still photo used during the closing credits for the show during it's first season. Interestingly, this footage is in color, while the first season was in black and white, indicating that at least some of the material done during its first season was shot in color.