Clifton Down Tunnel
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Clifton Down Tunnel is 1751 yards long. Halfway along its length there is an opening into a cave that exits half way up the cliffside of the Avon Gorge.
This ventilation shaft for the tunnel is on the Downs close to Bristol Zoo. © Rob Brewer
This second ventilation shaft is in Walcombe Slade. © Rob Brewer
A second look at the Walcombe Slade shaft showing the wire mesh, installed to prevent vandals dropping things onto the railway line below. © Rob Brewer
A bubble car bursts out of the tunnel and hurries through the Avon Gorge on its way to Avonmouth. © Simon Whittingham