Former astronaut Kathy Sullivan was the first American woman to walk in space in 1984. Last month, she became the first woman to submerge to the deepest known point in the ocean. Show more
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Former astronaut Kathy Sullivan was the first American woman to walk in space in 1984. Last month, she became the first woman to submerge to the deepest known point in the ocean. Show more
The BBC's international radio station
