check control option?

Checked already got swim up and swim, down both keys not working

In YouTube alot of ppl seamlessly dive down to progress to next area

try Z?

Finally gave in and purchased this game via HRKGame middle of last month and finished it last week.

On my GTX970 card, it still performed well with most settings at High, but shadows at Medium, but noticed that there are lighting glitches inside the Mantis when you land in Bogano. Other than that, the combat is good and the story is great. In fact, I'd say that it's way better than Star Wars: KOTOR 2, where the latter is Chris Avellone's first Star Wars effort.

To summarise, I'd say that it's a great single-player game and don't regret purchasing it.

but so short.....