Saturday, November 21, 2026
· In 2 weeks
Distance
Terrain
Difficulty
The Tunnel Marathon is a unique underground marathon held in the former Royal Navy UGHQ bunker near Portsmouth. Runners complete multiple laps through tunnels, some requiring stooping. Headtorch and cycle helmet are mandatory.
100ft underground
Historic UGHQ bunker
Tunnel running
Some stooping sections for tall runners
Start / Finish
Ucap Bunker, 100ft underground
Ucap Bunker, 100ft underground
Terrain
Route
What to bring
Headtorch
Cycle helmet
On the day
Marshals on course
Before you enter
Other questions
The marathon is run entirely underground in tunnels of the former UGHQ bunker. The course is lapped and includes some sections with 6ft headroom, requiring stooping for taller runners.
The event is held underground; spectator access may be limited. Check with the organiser for details.
Portsmouth, United Kingdom
Saturday, November 21, 2026
More races like this one
€69
entry fee
