SECRET LAGOON (Secret Lagoon) is a reef deep in grey rocks. It is the same as the sea, but it needs to drill through a cave to enter. Because the seabed is very shallow, ships can't get close to the cave. So tourists need to snorkel at high tide and water at low tide. Of course, it's much easier to have a kayak, because the seabed is full of reefs and dead corals, and it's very sturdy. Our captain was a very gentleman who had to carry us from a distance to the entrance of the cave. The opening of SECRET LAGOON is very small and needs to be drilled. The interior is connected to the sea and has water up to knee height. The cave is surrounded by rocks, and the closer the water is to the interior, the deeper the water is, the more it can snorkel inside. But the water was so turbid that it could hardly see what was under it.