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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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.
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.
Although both species of jellyfish living in the lake have stinging cells (nematocytes), they are not in general powerful enough to cause harm to humans. It has been reported that it is possible to notice the stings on sensitive areas like the area around the mouth.
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 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).
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.
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.