It is not often dived these days, as it is a main thoroughfare for speedboat traffic and the visibility can be low. However, divers may encounter manta rays at the mouth of the channel, and there have been reports of leopard sharks dozing on the sandy bottom. Ulong Channel Ulong Channel lies about 30 minutes by boat from Koror. The outer walls are steep and drop off far below. Inside the channel is a sloping sandy bottom punctuated with numerous coral heads.
Most dives start off with tooling around on the reef, where dozing whitetip sharks are common.
From there, divers drop into the channel and drift with the current. Depending on the tide, this can be a leisurely float or a hair-raising ride. Ngemelis Wall Ngemelis Wall is a popular wall dive, and everyone who comes to Palau dives it at least once. The top of the reef is a shallow bench, while the outside wall drops into infinity. Basically, you drop in, drift at a comfortable depth, and get picked up at the other end by the dive boat.