Unidentified sonar-like sound heard through Starliner's speakers

Photo: NASA

As Starliner is prepping to undock from the International Space Station and return to Earth uncrewed in a matter of days, a new mystery surfaces and leaves the crew baffled. On Saturday, astronaut Butch Wilmore alerted NASA's Mission Control about an unexplained "strange noise" heard from a speaker in the spacecraft.

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