Name of TV Series or Movie from the 80s early 90s?

The only thing i remember, is that there was some sort of structure (a boat) sunk on the ocean floor. And people lived inside it, because of a air pocket inside the structure. I think those people where passengers or crew of the vessel.
And i remember the ending of one episode, where a diver surfaced within the air pocket, and he was shot through the diving mask.

Anyone able to assist me in finding this movie/tvseries?

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