The Mirror Travel UK's longest tunnel is used by 900,000 people a day and runs for 17 miles
One tunnel holds the record as the UK's longest at 17 miles, carrying approximately 900,000 people daily - but another will claim the title in 2030.
One tunnel holds the record as the UK's longest at 17 miles, carrying approximately 900,000 people daily - but another will claim the title in 2030.