Koh Tachai has a myriad of nudibranch species and small frogfish can be fould by the very observant. Just off the southern point of Tachai island are two submerged pinnacles that also attract manta rays and other large schools of fish. The rocks here create swim-throughs and crevices that are homes for the varied marine life. This is a deep dive with strong currents and is less frequently dived by Thailand liveaboards than the plateau. Off the eastern coast of Koh Tachai a long coral reef runs parallel to a stunning white sand beach. This is an easy reef that is often dived as a sunset or night dive.