Visitors head underground to explore Channel Tunnel
16 September 2013 Last updated at 15:06 BST
Members of the public enjoyed special access to the Channel Tunnel over the weekend with guided tours taking visitors deep into the tunnel which links Britain and mainland Europe.
The tours run by the operator Eurotunnel were part of the European Heritage Days initiative which sees buildings not normally accessible to the public opened up for a short time.
Tom Bayly reports.