THE Mersey Tunnel Tour received its 1000th five star TripAdvisor review this week.
After beginning operation in 2006 with just one tour per week and now more than 5,000 people take the tours each year.
Now operating three evenings a week and two tours on Saturday, other tours can be arranged by appointment.
It is also ranked as the second most-popular tour in Liverpool on TripAdvisor.
Transport portfolio holder for the Liverpool City Region Cllr Liam Robinson said: “We’re extremely proud of our tour and the great feedback that we get from our visitors.
“The Queensway Tunnel opened 85 years ago and the tour gives a unique look at the skill and workmanship that went into creating it, plus a look at modern day technology and an understanding of the significant investment needed to keep the Mersey tunnels up-to-date and running safely and efficiently.”
The 1000th visitor review was written by Lis Lowe from Wirral who was on her second tour, she said: “The reason I came back was for my cousin from Seattle to experience it.
"When I came the first time I really enjoyed it, I thought 'I’d been there done that' but there were things that I had forgotten.
"I really should have visited again before now as you always pick up something new.”
Earlier this year Visit England recognised Mersey Tunnel Tours in its 2018 Attractions Accolades with a ‘Best Told Story award', one of only 16 awarded to tourist attractions across the country.
For further details or to book a tunnel tour visitwww.merseytravel.gov.uk/tunneltours