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

Saturday Jun 13

Centurion South Downs Way 100

Winchester

5 km

100 mi

A 100 mile non stop race along the South Downs Way from near Winchester to Eastbourne, with 12 aid stations, full medical support and a 30 hour limit. Entry requires a prior 50 mile qualifier within specified times.

Saturday Jun 13

Centurion South Downs Way 50km

Winchester

5 km

50 km

A 50 km nonstop trail race across the South Downs National Park with about 1,200 m of ascent, four aid stations, full medical support and a nine hour cut off. The course starts at Matterley Bowl and finishes at Queen Elizabeth Country Park.

Saturday Jun 20

Race To The King

Experience the beauty of the South Downs National Park with distances ranging from 30km to a 100km nonstop ultramarathon. Enjoy fully supported trails passing historic landmarks and stunning coastal vistas near Chichester Harbour.

Saturday Jun 20

Race for Life Pretty Muddy Southampton

Southampton

Mud Run / Obstacle Run

5 km

Pretty Muddy Southampton is a 5k mud obstacle course at The Common featuring climbing, crawling and sliding. The event supports Cancer Research UK, has a minimum fundraising target of £50 and is open to participants aged 13 and over.