Far more of our freshwater is stored underground as groundwater than is in our lakes, rivers, and streams. Philippe Cousteau travels to the Orange County Water District in Fountain Valley, CA,to meet with engineer Sandy Scott Roberts, who explains how they manage and use the freshwater from this surprising underground source.

Go behind the scenes with Philippe Cousteau as he meets with scientists, judges, and semi-finalist teams for the multi-million dollar Wendy Schmidt Ocean Health XPRIZE. Pioneering the future of ocean acidification research, these teams of engineers have been challenged to "create pH sensor technology that will affordably, accurately, and efficiently measure ocean chemistry from its shallowest waters… to its deepest depths."

EXPLORE: Have you ever wanted to work at a Marine Sanctuary? Have you ever even heard about our country’s Marine Sanctuaries? Learn more about life as the Research Coordinator at the Olympic Coast National Marine Sanctuary.