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This recording set is the Apollo 17 post-mission medical debriefing at the Manned Spacecraft Center in Houston, Texas, in 1972. Apollo 17 crew members and debriefers discuss the "light flash phenomena," a then novel and now well-documented biological effect caused by high-energy cosmic rays passing through the eye and striking the retina.

Two of the three crew members reported seeing the flashes at various points during the mission, including in lunar orbit and while on the lunar surface.

From part 1, at 48:45:

Uh, the light flash, uh, phenomena. We Three of us were blindfolded for an hour and uh never saw a light flash. That was the second round, the second round on the way back and the transverse. Eating, resting, exercise, and comfort. Let, let me add to the light flashes LP that the next, uh, that evening, I guess it was, I did see them again, falling asleep. So, I did too, so there was just that period apparently during the actual experiment that that for some reason they weren't because.

From part 2, at 17:04:

although we had light flashes, uh, just about continuously during the whole flight when you, uh, when it was when you were dark adapted. And I may have even had one which I thought was a flash on the lunar surface. Uh, during the first rev.

Declassified by the Department of War under the PURSUE UAP records release (tranche of 7/10/26).
Agency: NASA
Incident: 12/21/72, Texas
Document ID: NASA-UAP-D028-set
Recording length: 1 hour 43 minutes across 2 files.
Photograph: NASA, Apollo 17 crew arrive aboard the U.S.S. Ticonderoga, 1972-12-19 (NASA ID S72-55937).