Two nine-kilometre-long underground highway tunnels are creating 6 hectares of new open space in St. Peter’s (near Sydney Airport). More than 1600 custom tunnel horn loudspeakers provide security for this massive infrastructure project.
Two nine-kilometre-long underground highway tunnels are creating 6 hectares of new open space in St. Peter’s (near Sydney Airport). More than 1600 custom tunnel horn loudspeakers provide security for this massive infrastructure project.