Articles

Belgian Ultrarunner Karel Sabbe's Record-Breaking Pacific Crest Trail Run Showcased in New YouTube Documentary

Explore Karel Sabbe's record-breaking Pacific Crest Trail run in a riveting documentary. Jour..

Trail Running: How it Can Help Reduce Stress and Anxiety

Trail running is an effective way to reduce stress, anxiety, and improve physical and mental he..

Trail Running vs. Road Running: Which One Is Right For You?

When it comes to running, there are two primary options to choose from: trail running and road..

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 Aug 2

Harting Multi-Terrain '10'

Petersfield

10 mi

A volunteer run 10 mile multi terrain race across the South Downs with mile markers, two water stations and precision chip timing. Finishers get a unique medal and there is a free kids fun run plus homemade cakes at the pavilion.

Wednesday Aug 5

Highdown Hike

Ferring

5 mi

Community event at Worthing Rugby Football Club with a mixed-terrain five mile route and a shorter junior loop around the club pitches.

Saturday Aug 8

Brutal at Bordon

Bordon

Mud Run / Obstacle Run

5 km

10 km

Mudgy trail race in Bordon on mixed woodland and sandy terrain with 5 km single lap or 10 km two laps and a 75 minute first lap cutoff.

Saturday Aug 15

Phoenix Running - Hampshire

Backyard Ultra

This timed event on August 15, 2026, offers a flexible, multi-lap format on a smooth riverside course in Winchester. Runners can choose their start time and distance, from a single lap to an ultra marathon, within a 7-hour window. All finis..