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Audiovisual records of a Project Mercury pilot's activities during an orbital flight indicate that his visor was left open during reentry and descent to the sea surface, phases of flight during which cabin pressure loss was to be mitigated by suit pressurization; however, the suit could not have been pressurized with the visor open. Thus, for a presently unknown reason, a critical safety step-sealing the visor and making a pressure suit integrity test before reentry-was overlooked in thisdoi:10.7771/2327-2937.1114 fatcat:gnv2kdlmc5bvtg55kjj5yusnfu