A planned spacewalk aboard the International Space Station on the evening of Dec. 14 involving cosmonauts Sergey Prokopyev and Dmitri Petelin was canceled due to a coolant leak aboard the Soyuz MS-22 spacecraft.
The leak began around 7:45 PM EST on Dec. 14 (00:45 UTC on Dec. 15) when controllers in both Houston and Moscow noticed a visible leak coming from the instrument module on the Soyuz MS-22 spacecraft. Teams also received an indication noting low pressure in the coolant loop aboard Soyuz MS-22.