CLEAN : Breathtaking:freediving classes at world's deepest swimming pool

The transcript discusses the development and completion of a unique project: the deepest pool in the world, reaching a depth of 42 meters. It highlights the significance of this project for the free diving community and contrasts the sensations experienced when diving in a pool versus the sea.

What makes the project unique for the community of free divers?

What is the significance of the depth of the water as mentioned in the text?