Name of the world’s first human to visit both space and the deepest point (Challenger Deep)?

The Astronaut and Oceanographer Kathy Sullivan is the first human to visit both space and the Challenger Deep. On 7 June she accompanied fellow scientist Victor Vescovo to visit the deepest known part of the ocean called Challenger Deep. Sullivan made history in 1984 with NASA, when she became the first U.S. woman to walk in space. Kathy Sullivan has become the only human being to ever experience both extremes.