History
In December 1968, the tunnel first opened, to connect Terminals 1, 2 and 3 to the newly opened cargo terminal at Heathrow, and it cost £2 million to build. The tunnel is not open to the public; it is used only by vehicles with security clearance to drive airside. It is presently used for cargo movements, and transfer of passengers to and from Terminal 4 (In 1986, Terminal 4 was built next to the cargo terminal). From 1972, a London Transport bus service (route 82) operated through the tunnel. In 1986, when Terminal 4 opened, a number of other bus routes then also passed through the tunnel. This was an unusual situation, because anyone could board the bus, and travel "airside" without going through any security checks. In 1989, in the interests of security, all public bus services were withdrawn from the tunnel. All public buses now enter the central area through the main tunnel.
Read more about this topic: Heathrow Cargo Tunnel
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—Frances Burney (1752–1840)