Run this truly unique event as a pair or in a team. This 50km Ultra is held on 10km laps along the historic Two Tunnels path - old railway tunnels that head deep under the city of Bath.

The Tunnels are 409m and 1672m in length, so for every 10km lap you will be covering 4km underground, or over 20km underground during the whole Ultra.

Each runner will collect FOUR MEDALS as they go, which interlock to create a giant 15cm x 7cm image of the Two Tunnels trains departing Bath Green Park Station.

LIVE results, lap times, free post race massage and a selection of post race treats await the runners of this unique and historic event.

UK Athletics certified accurately measured course, reference number 236/2201c