On Tuesday, two Russian cosmonauts are spending some six hours in space, working to solve the mystery of who or what poked a hole in the Soyuz spacecraft.

Back in August, astronauts noticed a slight drop in pressure on the International Space Station. While not an immediate risk, the astronauts investigated and found a hole on the inside of the Soyuz habitation module, which is currently docked at the space station. Astronauts Sergey Prokopyev and Alexander Gerst repaired the two-millimet