Troubles seem to be mounting for NASA astronauts Sunita Williams and Butch Wilmore as it is now being reported that the former heard strange sounds coming from the Boeing Starliner on Saturday. This development comes just days before the spacecraft is scheduled to leave for Earth without the crew.

Wilmore, who has been aboard the International Space Station (ISS) along with Williams for over three months now, in a recorded conversation with the NASA Mission Control in Houston, reported hearing an unusual, rhythmic noise from inside the Starliner.