Why you should not dive to the bottom of Jellyfish Lake?

No scuba diving allowed. If the two layers of the lake ever were to mix, the entire ecosystem of the lake could be affected. Besides the fact that exhaust bubbles could harm the jellyfish, the deeper anoxic layer of the lake contains hydrogen sulfide, which is poisonous to humans.



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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.

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Jellyfish Lake is 400 m long and 30 m deep. Between 13-15 m, there is a pink layer of bacteria and below that, there is no light and no oxygen. The bottom water layer is filled with poisonous dissolved hydrogen sulfide gas.

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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.

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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 ...

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Talk to lifeguards, local residents or officials with a local health department before swimming or diving in coastal waters, especially in areas where jellyfish are common. Avoid water during jellyfish season. Stay out of the water in jellyfish areas when jellyfish numbers are high.

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One of Palau's salt water lake is home to millions of trapped jellyfish that migrate endlessly to cultivate an algae.

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Worldwide, only 13 jellyfish-lakes are known. These are located in Palau, Vietnam and Indonesia. Jellyfish lakes are landlocked islands of sea that of filled with immense populations of the golden-jellyfish Mastigias papua and the moonjelly Aurelia aurita.

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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).

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