Christoph Meier, a sound engineer at Mercedes-Benz, typically spends time making engine noise less jarring. For the carmaker’s new electric models, he’s had to do the opposite — create sound.

TEMPELHOF Airport has been many things to Berlin — a lifeline to German areas cut off after the great war, a centre of the city’s defence in WWII, and the hub of the airlift that ensured West Berlin’s survival over the cold war.