Easy sub sim for hand held PC

[lamboUK]

Hi. I really want to play a sub sim (any era) but it can’t be too complicated as I’d like to play it on a hand-held PC. Any recommendations??? Thanks for any help/advice.

[Platapus]

Crash Dive is one that I play on a tablet. I "assume" it is also available for the PC.

[Onkel Neal]

Yes, and Crash Dive II, both excellent.