It's a deep wall dive with the wall dropping at a vertical angle into the depths. (sipadan.com)
If you're into scuba, the outside southern rim of the crater is famous for being one of the best wall dives on the planet. (hawaiisnorkelingguide.com)
Many divers seek out sites with crystal clear waters and fantastic visibility but are sometimes unaware of the potential risk it poses, especially on wall dives. (liveaboard.com)