# Can the ISS boost maneuver engine be heard by the astronauts on board?

In the extremely cool demonstration video Demonstration of Acceleration Inside the International Space Station During a Reboost ISS Expedition 22 Commander Jeffry Williams says near the end at 04:48 that he could hear that the boost burn was complete.

I am not sure which engine was used for these burns in 2010, but how does it manage to make enough noise throughout the ISS to be heard over the drone of the ventilation system and all of the other equipment?

I here a faint "ping-pong" (sounds like the 7-11 automatic doors where I live) just before Williams speaks, but I'm assuming that's a video camera being turned off.

video cued at 04:48

• @GittingGud I can speculate and imagine as well as anyone else, but here I'm looking for an authoritative and sourced answer.
– uhoh
May 16 '19 at 6:56
• The nasa publication Acoustics and Noise Control in Space Crew Compartments might have an answer for you but it might take some time to find the information n the 500+ pages.(ISS starts at page 256) May 16 '19 at 7:04