When the Russians' Progress cargo ship docked with the space station, cosmonauts noticed an unexpected odor and observed small droplets, causing immediate precautionary measures.
The hatch connecting Poisk to the Progress cargo spacecraft had to be closed due to a toxic smell and possible contamination hazard from droplets.
American astronaut Don Pettit reported a "spray paint-like" smell on the American side of the ISS, though it's unclear if it was related to the Poisk odor.
Repeated leaks have plagued Russia's spacecraft, with prior issues involving coolant leaks in both a crewed Soyuz capsule and a Progress cargo freighter.
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