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

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 noticing the odour, the crew swiftly closed the hatch to isolate the affected area from the rest of the Russian segment.