So, I've been thinking of learning scuba diving.

[Statyk]

I also want to get rid of two phobias I have which is the fear of very deep areas (looking down to find that there is nothing under me) and shipwrecks.
So, shall I go for it?

I think it's a great step to take if you plan to become a Marine Biologist. Plus it does sound fun in its own way. I used to love watching videos in science class of people going out and doing this stuff. I say read up and go for it. Nothing wrong with trying something every once in awhile. You may come to love it. I know when I was little, I used to watch people snowboard and go "that looks like so much fun", started going down town hills in a $10 Wal-Mart board, and once I hit 13, I finally got a professional snowboard for Christmas. Been snowboarding on mountain trails every Winter since <3