Have you ever been in a submarine?

Yes we have! Went down in one at King's Bay.

Yes but not submerged.

The USS Albacore. The sleeping quarters were claustrophobic . . .

http://www.ussalbacore.org/

I'm not a big fan of being underwater, so I think it'd be kind of afraid to be in one (if it were submerged).

at a theme park, to go under the water just a little to see the fish, etc...................that count?

I am with the Donald.

I went on the Disneyland ride submarine many many many years ago.

No, the closest I've come was the Disney ride and the old diving bell at Ocean Park ... Long since closed down.

No. I would be to scared.