Cenotes are natural swimming holes or swimming caves in Mexico. They’re formed by the collapse of porous limestone bedrock. When the rock falls it reveals a secret subterranean world of groundwater pools! Most cave cenotes have fresh water that has been filtered by the earth. This makes the water super clear and pure. So clear in fact that you can often see straight through to small fish darting about in the plants. Watch the sublime new video by Alchemy freediver and content creator Alex Voyer, featuring Marianne Aventurier and shot in the Mexican Cenotes, during one of their recent trips.

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