On February 18, 2023 at 05:26 Moscow time the Russian “Progress MS-21” unmanned supply spacecraft was undocked from the “Poisk” module of the International Space Station, keeping a departure date that has been set for months. But the routine undocking took special significance after the “Progress MS-21” cargo ship suddenly leaked coolant on February 11, soon after the docking of a fresh Progress (“Progress MS-22”) resupply spacecraft to a different port on the space station.