There are four tunnels in that underwater area (If you got through the right entrance you will have a choice of 2 and if you go through the left entrance you have a choice of two).
I went through all four (you really have to make sure you do 3 out of 4). The only one that I could never get out of is the one you are currently in. There are easy exits out of the other 3 (as well as quest solutions in them).
I would suggest you reload the position right before you swam in there.
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