Snorkeling in Jellyfish Lake is a popular activity for tourists in Palau. Tourists require a pass to access to Jellyfish Lake. The Rock Islands/Jellyfish Lake pass is $35 and is good for 10 days.
Scuba diving by tourists in the lake is not allowed. Two reasons are put forward for this:
* The bubbles from scuba tanks can harm the jellyfish if they collect beneath their bell.
* The anoxic layer that begins at about 15 meters contains high concentrations of hydrogen sulfide which can be absorbed through the skin of a diver and can lead to death.
