6 titles.

1. Frasier (1993 TV Series)
Episode: Miss Right Now (2004)
Judging by the diving bell she wore as a nightgown, she wasn't real big on post-marital sex either.
2. MacGyver (1985 TV Series)
Episode: The Odd Triple (1988)
Are we great or what. What a team and since we're already all here together, I heard about this sunken treasure. Fifty million dollars in Nazi gold. See, this ship was torpedoed right off the coast and the gold was lost. All we gotta do is get a diving bell and three bathing suits and...
3. The Diving Bell and the Butterfly (2007)
My diving bell has dragged you down to the bottom of the sea, with me.
4. Teenage Mutant Ninja Turtles (1987 TV Series)
Episode: Leonardo Versus Tempestra (1990)
Dude, we're aquatic creatures, remember? How come we need a diving bell?
5. Plankton (1994 Video)
They must have caught them with the diving bell. Certain fish you can only get from way down deep.
6. The Man from Planet X (1951)
You know what that looks like to me - a big diving bell1
6 titles.