A Russian segment of the International Space Station was locked down this weekend after cosmonauts found an “unusual odor” emanating from a visiting cargo capsule, NASA said.

Russian cosmonauts aboard the ISS were forced to seal a hatch and don protective equipment after the arrival of a cargo vessel brought with it a bizarre smell.

The hatch between a Russian cargo ship and (ISS) is finally open after a foul stench initially prompted astronauts to seal it off. The good news is, the smell has not lingered and NASA may have figured out the cause.

A Russian module bringing cargo to the International Space Station delivered more than just supplies on Saturday — it brought a stench. When astronauts opened the Progress 90 resupply spacecraft, they were greeted by small droplets and an “unexpected odor,