The Passage is a 52min documentary following World Champion Freediver in his exploration of Yucatan Peninsula in Mexico.
Here is the final scene of the film, when Guillaume explores the magic of the Cenotes.

Directed by Romain Dussaulx and Denis Lagrange
With Guillaume Néry
Underwater images by Denis Lagrange
A production GRAND ANGLE

The film is available on amazon.
Search for the french title: La Traversée des Mondes.