Sounding the Air Raid Siren at Cleanroom Supplies

We recently performed a full-power test of our new apprentice Isaac's recently restored MEZ H1/B2 Civil Defence Siren, which was used in Czechia during the Cold War.
To discover the interests of the rest of the Cleanroom Supplies Team, click the following link:
cleanroomsuppl...
Isaac's KZbin channel:
/ @civildefencefox