The dive site is often considered one of the best dive sites in the country, due to the large number of large fish that can be seen on a regular basis. This is a very good dive site within the Similans and it is made up of several dive sites, including Koh Tachai Plateau, but the two pinnacles or Twin Peaks are the most dived spot in the area. Divers often come here on their way to Richelieu Rock and can be rewarded with an excellent plateau of boulders, hard corals, as well channels and many swim throughs.
The two pinnacles have a ridge that runs between the two, with most divers staying on the southern rock because of the somewhat strong currents. The currents bring the many fish that are constantly darting around. These strong currents mean that the dive can sometimes only be suitable for experienced divers.
Larger pelagic fish are commonly seen in the area and include large groups of tuna, schools of barracuda, and manta rays. Although whale sharks are more commonly found on Richelieu Rock, they can also sometimes be spotted in this area. Divers can also commonly see nurse sharks, other types of rays, leopard sharks, and hawksbill turtles. Other fish to look out for include unicorn fish, triggerfish, fusiliers, sweetlips, groupers, and snappers.