During the coronavirus pandemic, cities all through the world emptied as lockdown restrictions had been applied.
A PhD pupil from Queen’s University Belfast used this time to make recordings for his last analysis mission.
Georgios Varoutsos used his day by day lockdown walks to file the sounds of Belfast city centre.
Like many cities all through the UK, Belfast had beforehand been dominated by the sound of human exercise. During lockdown, these had been changed by refined industrial, city and pure sounds.
BBC News NI merged Georgio’s sound recordsdata with drone footage taken in Belfast city centre during and after lockdown.
Video journalist: Niall McCracken