I learn something new about the astronaut business on every mission. During their spacewalk last week, space station residents Mike Fossum and Ron Garan did some whistling while they were inside the Quest airlock in their spacesuits, waiting for the pressure to drop before heading outside. I’ve queued this video up to the whistling sequence, which ends at about the 5:40 mark. You’re looking at the outside of the airlock.
During a news conference with the Atlantis astronauts, Fossum explained what he and Garan were doing: