SLF and engineer in aerospace industry.
The depressurization report was near Toledo. High ground in central Spain is at about 2500m. A direct line from Jerez de la Frontera to Cologne would take take you over the Pyrenees which has 3000m peaks.
What happens if you have depressurisation whilst flying over high terrain? Could the thought of emergency decent above high terrain delay the decision making perhaps? What altitude would you be comfortable making an emergency descent to, a thousand feet above the highest terrain in the area? Do you pre-plan that emergency descent altitude if the flight plan takes you over high ground? Just curious.