/// uncovering metropolitan infrastructures ///
Maybe it's an exhaust vent? I know in some of the tunnels under seattle they have crazy fire suppression systems that flood the tunnel with foam so they can push the O2 out. Then they have to vent it quickly.
Maybe it's an exhaust vent? I know in some of the tunnels under seattle they have crazy fire suppression systems that flood the tunnel with foam so they can push the O2 out. Then they have to vent it quickly.
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