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it home reported on september 2 that nasa astronaut barry wilmore called nasa ground crew on saturday and asked for help in solving the "repetitive knocking sound" emitted by boeing's starliner.

it home noted that the recording showed that wilmore asked the ground control center to adjust the call settings in order to show the sound. he said the sound came from the speakers inside the starliner spacecraft. subsequently, a repetitive clanging sound could be heard, which the ground team members described as "very much like a sonar signal."

the mysterious sound may have a very mundane explanation, such as someone on reddit comparing it to a certain feedback loop, and neither wilmore nor the members of nasa's ground control center seemed particularly worried.

the boeing starliner is currently scheduled to separate from the international space station (iss) on september 6 for an unmanned, automatic return to earth mission. astronauts wilmore and sunita williams, who were originally scheduled to ride on the spacecraft, will remain on the iss until early next year.