In 2013, a critical life-support system on the International Space Station failed, requiring an immediate spacewalk to fix it. NASA astronaut Chris Cassidy made the repair and saved the space station. As an astronaut, he was trained extensively for space walks. But how do astronauts train here on Earth to work in the microgravity of space? Astronaut: Ocean to Orbit explores the ways in which NASA uses underwater environments to simulate life and work in space, offering a fascinating look into the high-tech world of astronauts. Join astronaut Chris Cassidy (current ISS Commander) as he trains in his space suit alongside a full-sized mock-up the International Space Station in a giant underwater facility in Houston. Dive to the sea floor with NASA astronaut Jeanette Epps as she lives underwater with fellow astronauts for ten continuous days at Aquarius Reef Base in Florida. Find out what it takes to live and work in space.