13th or 14th May 2017

7km Saturday
12km Saturday£70.00*Book-now-buttons
7km Sunday£60.00*Book-now-buttons
12km Sunday£70.00*Book-now-buttons
Purchase Dryrobe get a free race*
Purchase Dryrobe get a free race*

*prices shown exclude booking fees


Race Details

Choose from 7km or 12km course distances over ultra-gritty, properly muddy, obstacle-loaded farmland set in the heart of the Secret Bunker Estate, Essex.

Minimum age 7km – 13yrs
Minimum age 12km – 16yrs

Nuclear’s well known for delivering award winning events with big, high quality man-made obstacles designed to challenge and test every ability of fitness on fast-paced, flowing, punishing courses over epic natural, varied terrain. Expect the infamous Deathslide, Zip-lines & World’s longest monkey-bars (Gorilla Bars) at this event.

Join us for a chilled OCR festival weekend packed with obstacle racing for all the family (Rookie kids included), camping, live music & entertainment for all ages.

Event Format

  1. The course distances are 7km & 12k. This event is NOT a lap race.
  2. Your wave will be made up of 7 & 12k runners. You will run together until 7k where 12k runners will split. There’ll be warning signs, arrows and a Nuclear marshal at the split to guide you.
  3. There are 90+ obstacles on the 12k, 50+ on the 7k courses.
  4. Attempt as many or as few obstacles as you like – it’s your challenge!
  5. There are no penalties for failing or missing out an obstacle (except the Gorilla Bars) 

Before the day

On the day

The Course

  1. Water depth: Water on the course is around 5’ deep depending on weather conditions. There are frogmen-marshalls in the water at the Deathslide obstacle./li>
  2. Swimming: water obstacles need a small element of swimming ability
  3. Water Stations: There are 4 x mains connected water-stations on12k course & 3 x water-stations on 7k. There’s x 1 water-station in the event village.
  4. Litter: We do not supply energy gels/foods. If you use them, please be mindful of our countryside & eat them either at an obstacle or put in the bin at water stations.
  5. Marshalls: are clearly marked in yellow hi-viz Nuclear Races jackets & are at all major obstacles on the course to keep you safe & guide you.

Obstacle Angels: A number of experienced obstacle racers will be on the courses ready to guide & advise #NukerNewbies or seasoned racers at trickier obstacles – where technique helps. Angels are marked in white hi-viz jackets.


We encourage you to bring your friends and family along to watch (there’s a small £2 ppl spectator entrance charge, admission for children under 16yrs is free). All spectators will need to sign in at registration before entering the event village.

Spectators are reminded that entering our private land is at their own risk. The entire event is Health & Safety checked prior to and throughout race day. Spectators must make their own decision as to whether they can reach or undertake the journey to spectating areas, which due to the nature of the sport, may be on uneven terrain.

There are excellent spectator obstacle viewing areas in and around the village (first 2k & last 2k). A course map in event village shows spectator accessible zones. Follow the black spectator signs to designated viewing areas. There’s no access to the full course due to safety concerns. Please tell your supporters to adhere to the No Entry signs & not to walk across fields of crops. Well-behaved dogs on leads are welcome, please clear up after them.

Helpful essentials

  • Toilets
  • Ample Free grass field car-parking
  • Selection of good hot/cold food & drinks
  • Licensed Boom Bar – beer, cider, soft drinks. Live bands, seating. Cards accepted.
  • A range of trade stands including Nuclear Merchandise Shop – kit & accessories. Cards accepted
  • SV Sports Therapy Injury Specialists, pre & post race sports massage

Official Nuclear Photographs

On the day of the Nuclear event, there are more than 8 official photographers situated around the course.

The photographers are at 8 different points around the course to get shots of individual runners.  They also take photos of runners crossing the Finish Line, capturing the big moment for them to keep. After the Finish Line you can take your FINISHER photo and MEDAL shot, just look out for the bright Orange vests – and remember to smile!

  • LIVE RANKING RESULTS/TIME UPDATES in the RACE VILLAGE: Provisional live results are available on race day. We’ll post results on our website as soon as the chip timing team have verified them. Please bear with us while this is being done.
  • AFTER PARTY: Get stuck in, find a bale, soak up & share your post race achievement & muddy experience with the others from the #NuclearFamily & obstacle racing community. Licensed Boom Bar, live bands, seating, kids climbing wall, chilled festival vibe.