Bonjour! CYUL, Montréal’s international airport is half underground. It looks like a very slight mound, like 10 of feet of, sorry, 3.048 metres of dirt were spilled across the northern half of the airport, runways, and gates.
Nothing is wrong with the airport. Simply a scenery mishap it seems. The airport has already been edited fully. The Airport Editing Team never release airports with unfinished taxiways or other items that the airport has irl. 🙂