The Yucatan Peninsula sits on top of the largest known underwater cave system on Earth. Divers have mapped 360km of it. A new passage opened during last year's hurricane season. It leads somewhere that doesn't appear on any existing survey.
The Yucatan Peninsula sits on top of the largest known underwater cave system on Earth. Divers have mapped 360km of it. A new passage opened during last year's hurricane season. It leads somewhere that doesn't appear on any existing survey.