Richelieu Rock is suitable for intermediate to advanced suba divers. As Richelieu Rock is the only food source in the immediate area, it is an excellent scuba dive site for encountering large pelagics. Rainbow runners, great and chevron barracuda, trevallies, tuna and jack are all frequently seen.

Predominantly, this is a wall-dive which follows around a main outcrop surrounded by smaller submerged pinnacles whose peaks range from 3m to 10m below the surface. In the deeper waters around the three southernmost pinnacle is a collection of large gorgonian sea fans, immediately beneath radiant hermetypic corals. Richelieu Rock is one of Thailand scuba diving's most dramatic underwater rock formations .

Around the corals is a wide diversity of marine life: residents include schooling bannerfish, a variety of snappers and lionfish, Moorish idols. Titan triggerfish, and even shovelnose rays. Dive in Thailand at Richelieu Rock for bearded scorpionfish, stonefish, moray eels, seahorses, shrimps, crabs and nudibranchs.