Heidemarie Martha Stefanyshyn-Piper (born February 7, 1963) is an American Naval officer and former NASA astronaut. She has achieved the rank of Captain in the United States Navy. She is also a qualified and experienced salvage officer. Her major salvage projects include de-stranding the tanker Exxon Houston off the coast of Barbers Point, on the island of Oahu, Hawaii, and developing the plan for the Peruvian Navy salvage of the Peruvian submarine Pacocha.

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