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A U.S. Marines helicopter hovers over the Atlantic ocean during an attempt to retrieve the spacecraft Liberty Bell 7, which sank 15,000 feet shortly after splashdown on July 21, 1961. At top of the spacecraft is the “horse collar” hoist which would have been used to lift astronaut Virgil “Gus” Grissom, who had to swim from the craft. The duration of the Mercury-Redstone 4 test flight, which is the second U.S. manned suborbital spaceflight, was 15 minutes and 37 seconds. (Photo by AP Photo/NASA)
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