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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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 ...
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.
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.
Ask your scuba operator where you'll be diving, and make sure you have the right certification and level of skill for the dive. There are saltwater crocodiles in parts of Palau, and no warning signs to indicate their presence.
As of 2022, Jellyfish Lake in Palau is open to the public. Is it safe to swim with jellyfish? It is very safe as the jellyfish don't actually sting. You just can't dive deep here (below 15 meters) as there is hydrogen sulfide at the bottom of the lake, which is harmful.