NASA and Roscosmos immediately activated air-scrubbing systems across the station. The U.S. segment deployed the Trace Contaminant Control Subassembly (TCCS), while Russian segments used additional purification systems.

Upon opening the hatch of the newly docked resupply ship, Russian cosmonauts detected a strong, unfamiliar smell and observed small droplets.

It should have been a routine mission to ferry about three tons of food, fuel, and supplies to the International Space Station, but when Russian cosmonauts opened the hatch to a cargo spacecraft on Saturday,