Former NASA astronaut Kathy Sullivan became the first woman to reach Challenger Deep, the deepest point in the ocean. Sullivan was also the first American woman to complete a spacewalk over 36 years ago. Now, she’s the first human to have done both.Sullivan was a part of a roughly 5-hour expedition this week that went 10,925 meters below the surface of the Pacific Ocean. She was joined by pilot Victor Vescovo of Caladan Oceanic, a private company dedicated to the advancement of marine technology.