In the Pacific island nation of Palau, there's a seawater basin called Jellyfish Lake. Approximately 13 million jellyfish live in its waters. Most of them are Golden jellies (Mastigias papua etpisoni) and Moon jellies (Aurelia aurita), both of which sting so softly that they effectively can't harm humans.
So it's a popular diving spot. Visitors swim in the pristine blue waters surrounded by millions upon millions of these beautiful creatures. YouTube user mikeyk730 was among them. He shot this video showing himself immersed in a blue universe of jellyfish. The music that accompanies his footage is Ludovico Einaudi's "Nuvole Bianche."