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.
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 ...
Contrary to popular belief, these jellyfish DO have stinging cells used to capture tiny organisms (zooplankton) for food. They inherited the stinging cells from their lagoon ancestor Mastigias papua. However, you are unlikely to feel it as the sting is very mild and essentially harmless to humans.
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.
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.
The Tárcoles River is home to over 2,000 crocodiles and, as such, is considered the river with the most crocodiles per square mile. But are there any other rivers that can possibly compete with this famous river? The Nile Crocodile can grow up to 20 feet long and weigh up to 1,650 pounds!
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).