Diving in the Lagunas Verdes, the highest lakes on the planet

Frédéric Swierczynski and Sébastien Devrient set off to explore the high altitudes of the Ojos del Salado glacier mountain in Argentina. This volcanic mountain is home to the world's highest lakes. They recount their expedition in a new documentary film.

Situated at an altitude of 6,390 metres, with a depth of no more than ten metres, the highest crater lake on the planet is ephemeral. Its formation hinges on a series of favourable elements that only Mother Nature holds the secret to: a cold winter, boiling soils and strong winds serve to fill a sludge only a hundred metres in diameter. Ojos del Salado is in fact the world's highest active volcano. On this mountain, glaciers formed during cold winters disappear at an accelerated rate due to the warm soils, leaving room for lakes to form t