Scientists noticed a pressure leak on the ISS back on Aug. 29 of this year. They determined the source was a 2-millimeter hole in the Soyuz capsule and quickly filled it up with epoxy. NASA reported that the astronauts were never in any danger.

Since then, photos of the hole revealed that it looked an awful lot like a drill hole. Russian authorities intimated that it could have come from “deliberate spoilage,” but stopped short of making direct accusations.