There are approximately 700,000 jellyfish in this lake and none of them sting! You can only snorkel here because deep in the lake there is poisonous hydrogen sulfide gas that would not be safe if diving.
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Though swimming is permitted, scuba diving is highly prohibited as the bottom layer of the lake hosts a poisonous hydrogen sulfide gas that even the lake's jellyfish don't swim near.
All visitors are required to purchase a 10-day Rock Island Permit for 100 USD (50 USD if you access the Rock Islands but not the Jellyfish Lake). Take also into consideration that if you are planning to book a day tour to the Jellyfish Lake expect to pay between 100-250 USD (excluding permit costs).
How to Visit the Jellyfish Lake in Palau. Jellyfish Lake (Ongeim'l Tketau) is located on Eil Malk Island in Palau, which is part of the Rock Islands. It's about 45-minutes from Koror. A 10-day pass for swimming with the jellyfish is $100 USD, though this is not included in the price of most tours.
However, scuba diving in the lake is forbidden for two reasons: First, to protect the jellyfish, as the bubbles are likely to get caught under the bells. Second, about 15m (16.4 yds.) below the surface, there are high concentrations of lethal hydrogen sulphide, which can be absorbed through the skin.
Contrary to tourist myth, the jellyfish are not “non-stinging”; rather, the lack of natural predators in this marine lake (inside an island, inside an ocean) has led them to evolve away from having very strong stinging cells, so that most of us can glide through the water, bumping into the floating, dancing clear blobs ...
All jellyfish have stinging cells in their tentacles. Most people are not bothered by touching one from our beaches with their hands. However, you should not rub your eyes or put a finger in your mouth after handling a jellyfish because this could cause you pain—and maybe even more serious problems.