Knocking tree times on a metalic door, close up, several takes. Note that a small electric rumble should be removed. France, 2018. Recorded with schoeps ab ortfrecorded on nagra ares bbwave stereo, 48khz, 24bits.
The sound of a "push bar to open" fire door being opened. It could also be used as the sound of a car door closing. Recorded on a zoom iq7, then mixed to mono.