The hole is about 60 meters long, the hole is bow-back shape, when the tide is rising and falling, the height of the hole is about 2.5 to 4 meters, at the low tide can take a boat or speedboat into the interior, as if entering the city, immersed, there is a feeling of isolation from the world. After entering, suddenly open, there is no cave in the cave, the ring rock wall can see groups of monkeys, it feels like an adventure.