There had been a number of different attempts to tunnel under the Thames, including one by British inventor and mining engineer Richard Trevethick in 1807, but all of them ended as failures.

The planned project, which the government hopes to start work on next year, includes the longest road tunnel in the UK.

LONDON, March 25 (Reuters) - Britain gave the green light on Tuesday to a new 10-billion-pound ($13 billion) road tunnel for the River Thames in southeast England, in its latest backing for an ...