Christopher Hadfield himself twice in his career went into outer space.
At the moment of being in outer space, an area of specially lowered pressure is created in the spacesuit, because of which it will not work in any way to whistle. This was told by Canadian astronaut Christopher Hadfield.
“The air is too thin at a pressure of 4.3 psi,” – so he answered a question from one of his subscribers on a personal website.
This pressure, equal to 220 millimeters of mercury, is deliberately lowered inside the suit to facilitate work in it.
Astronaut Christopher Headfield has performed two EVAs in his career. In addition, he is known for recording a clip for a song by British rock musician David Bowie, made right on the International Space Station.