diving sail rock

Today I've continued my diving course with a Swiss couple. We went on a boat and drove out to the sail rock. A massive stone formation half way to Koh Tao and 20 km northwest of Koh Pha-Ngan. You can onlly see the top of it, but it reaches down about 28 m. At 12 m depth there is a little sand bank and between 9 and 18 m there is a chimney to dive up and down. Cool stuff. It's fascinating to breathe under water and you can see loads of fish and corals.