The Channel Tunnel linking Britain and France holds the record for the longest undersea tunnel in the world – 50km (31 miles) long. More than 20 years after its opening, it carries more than 10 million passengers a year – and more than 1.6 million lorries – via its rail-based shuttle service.
What many people don't know, however, is that when owner Eurotunnel won the contract to build its undersea connection, the firm was obliged to come up with plans for a second Channel Tunnel… by the year 2000. Although those plans were published the same year, the tunnel still has not gone ahead.
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