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The Tunnel Marathon - Portsmouth

Name: The Tunnel Marathon - Portsmouth
Start: 2026-11-21
End: 2026-11-21
Location: Portsmouth

Portsmouth, United Kingdom • 21 Nov 2026

The Tunnel Marathon Take 3 2026

The Tunnel Marathon Take 3 2026 is described as the UK’s only fully underground marathon. It is scheduled for 21st November 2026 and will take place at UCAP BUNKER, located about two miles north of Portsmouth at postcode PO17 6AR. The venue sits roughly 100 ft underground in the former U.G.H.Q used by the Royal Navy during the Normandy invasion and is also used for Airsoft close quarter battle training.

Entries open on 6th March. The event has a race cut off of six and a half hours. A headtorch and a cycle helmet are mandatory for all participants.

The course will be a multi lapped route similar to other underground or museum style marathons. The exact final route is not yet finalised. The route will use several tunnels, some with a height of about 6 ft, which will require stooping in those sections. These low tunnel sections are around 20 m long and will be encountered frequently because of the lap format. Visit the organization's website for the most recent information.

United Kingdom Portsmouth

Race information

Website

26 mi

Marathon

Visit the organization's website for the most recent information.

Trail runs nearby

Sunday May 17

The Newchurch Nine

A community trail run at Newchurch Primary School on 17 May 2026 offering three distances from 900 m to 9 km. Entry fees are £8 to £17.50, medals for all and a raffle with prize draws. Proceeds support school learning resources.

Sunday May 17

Pulborough Vineyards Run

...

Off-road multi lap run at Nutbourne Vineyards with views to the South Downs. Choose distances from 5 km up to a half marathon on the day; entry is £29, places are limited to 100, and finishers receive a medal, drink and cake.

Saturday May 23

Phoenix Running - Hampshire

Hampshire

Backyard Ultra

13 m

Run a flexible distance along Winchester's scenic Itchen Way. Choose your laps from 2.62 miles up to an ultra within a 7-hour window, with a famous aid station and a finisher's medal for all.

Sunday May 31

Southampton Running Festival

Races at Southampton Common include Half Marathon, 10k, 5k and a junior race on a multi-lap course through woodland, wetlands and parkland, with kilometre markers, marshals and an event village offering food and partner giveaways.