This video from the USA says about itself:
7 April 2017
This amazing Behind-The-Scenes Blue World adventure takes viewers to Devil’s Hole Cave (sometimes called Devil’s Hole II) in Nevada to explore the aquifer that lies beneath Death Valley! The Blue World team is working on their first giant screen film for IMAX® Dome (OMNIMAX®) theaters, featuring the most incredible cave diving adventures around the world. This epic Blue World episode takes viewers behind the scenes of our shoot in Nevada.