Bobby Brown, Dara Howell and other Red Bull athletes got together in Hawaii to test their physical and mental strength, this summer. The bunch completed a series of breath holding exercises, eventually bringing their newly developed skills from a pool to the ocean—free-diving 100 feet down into the deep blue sea. Check out the highlights from the trip, above.

Note: You may not want to try this at home…

Related: You’ve never seen a double cork 10 quite like this, courtesy Bobby Brown and GoPro