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Mercury-Redstone 4
Mercury-Redstone 4 was the second United States human spaceflight, on July 21, 1961. The suborbital Project Mercury flight was launched with a Mercury-Redstone Launch Vehicle, MRLV-8. The spacecraft, Mercury capsule #11, was named ''Liberty Bell 7'' and piloted by astronaut Virgil I. "Gus" Grissom.
The flight lasted 15 minutes 30 seconds, reached an altitude of more than and traveled downrange, landing in the Atlantic ocean. The flight went as expected until just after splashdown, when the hatch cover, designed to release explosively in the event of an emergency, accidentally blew. Grissom was at risk of drowning, but was recovered safely. The capsule sank into the Atlantic and was not recovered until 1999.
==Crew==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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