@flightradar24
3h
#SAM153 from Brussels has turned back toward the UK squawking 7700 with a descent down to 10,000 feet. Descents down to 10,000 often indicate an issue with aircraft pressurization. 
https://flightradar24.com/SAM153/3cac4d86

Playback of flight RCH153 / SAM153
https://www.flightradar24.com/data/flights/rch153#3cac4d86