Palau is surely an underwater wonderland where one trip is never enough. Most of the dive sites in Palau are world-class and unique with amazing underwater features like blue holes, caverns, cave, drop-offs and channels. Sharks are especially plentiful in Palau where the other predators like tuna, giant trevally and sailfish are joining them for food. Moreover, a very unique event that must be witnessed in Palau is the spawning of the two-spot red snapper or green humphead parrotfish. Other than that, Palau is also one of the fewer places in the world to see Nautilus which is fascinating.