Unexplained leak from docked Soyuz spacecraft cancels Russian ISS spacewalk

A stream of particles, which NASA says appears to be liquid and possibly coolant, sprays out of the Soyuz spacecraft on the International Space Station, forcing a delay of a routine planned spacewalk by two Russian cosmonauts December 14, 2022 in this still image taken from video. NASA TV/Handout via REUTERS

A routine spacewalk by two Russian cosmonauts aboard the International Space Station (ISS) was called off as it was about to begin after flight controllers noticed a stream of liquid spewing from a docked Soyuz spacecraft, a NASA webcast showed.

The spray of fluid, which was visible in NASA's live video feed as a torrent of snowflake-like particles emanating from the rear section of the Soyuz MS-22 capsule, was described by a NASA commentator as a coolant leak.