Perhaps this is the most famous retro game that has an underwater theme. Anyone remember this one?

Super Mario adventure island contra metal slug <3 these are master piece for me
Now playing pc ps5 games which have amazing graphics but believe me not enjoying them like what we did with old games this gives me Goosebumpsmermaid madness on the commodore64 to continue the underwater game theme.
A bizarre game where you were a mermaid trying to catch a scuba diver who you were in love with. If you left the water the mermaid became a fat naked woman that you could control which was amusing for me and my brother at the time.
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Heyjjohnwm , look at this I found on one of my sky apps, lol.View attachment 1511812
You should try it, Esox
When you mentioned "asteroids" earlier in the thread I thought little of it, until I came across that game on my sky apps.
I went into the app and immediately recognised it as a popular game that used to be in the pubs I frequented as a young man. I was never any good at it, unsurprisingly really as I was usually plastered, lol.
I don't recall the "deluxe" version though.