On June 8-9, Kathy Sullivan and Vanessa O’Brien became the first women to reach the deepest known point in the ocean, the Mariana Trench. Neither are new to world firsts: Sullivan, 68, is an astronaut and oceanographer; she was the first American woman to walk in space in 1984, and later became the administrator of … Continue reading To the Bottom of the Sea: Interview with Vanessa O’Brien