It's 110,000 won per person if not scuba certified. Info and booking here: http://www.scubainkorea.com/
I went with my friend, Kaitlin, and we took the slow train (Korail) from Seoul Station (27,000 won each) on Saturday and hung out in Busan at the Rock and Roll Pub (Full of foreigners, I recommend it.) just across from the aquarium, which is directly on the beach, a few blocks (walking distance) straight out from exit 3 of Haeundae subway station. Busan only has 3 subway lines to navigate (yay!), but your T-money card won't work there.
There are lots of really nice beach-front hotels and a few hostels you can find online. We chose Korea's sleaziest love motel for 40,000 for two of us for one night. It had a circle bed surrounded by mirrors; we nearly busted a gut laughing so hard when we walked in. Love motels are the Korean equivalent of American roach motels, though I've not seen any roaches in them yet, and instead of being shady places to stay, they're clean, cheap, and safe, although often falling apart.
The dive was not what I expected. I felt the scuba training was rushed, and I was so focused on