Wait, what?

Is your tinfoil hat on? Dmitry Rigozin: we do not exclude the possibility that the Soyuz MS-09 hull was drilled through deliberately while in orbit; also, it was definitely not a meteor!

Excuse the Google translate awkwardness.  

The three options:

• Micrometeor/debris strike that happened to line up with an existing hole that was partly drilled through the hull already. Virtually impossible.
• Construction worker mistakenly drilled a hole and plugged it with glue that eventually fell out.
• Sabotage by someone on the station.
  
  
  Update:
  
  
  Well, looks like the Russians have identified the culprit, and employee on Earth who messed up.
  
  
  According to another source, the employee, most likely, after he realized the error, sealed the crack with special glue, so it was not detected during the test of the spacecraft on the tightness before launching and did not make itself felt the first two months of the orbital flight.
  "However, in the future, the glue dried and was squeezed out, opening the hole," - said the second interlocutor.
  
  
  I guess that guy will be transferred to Siberia now.