Nuclear Blast

Nuclear Blast is a 5km obstacle loaded multi-lap course over mixed, muddy terrain suitable for all levels of fitness. Fun, exhilarating and achievable, it’s the night-time Blackout course but in daylight!

Participants race through a death slide during the Muddy Runs Nuclear Blast

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Obstacle Course

Blast is the perfect introduction for a newbie – 5k to #popthecherry, 10k for some and 15k for others!


  • Run as many 5km laps at night as you can or would like to in 2 hours  (For example, if you cross the line at 1 hour 59 minutes you can continue on your final lap and be in with a chance of winning the race)
  • Great introduction for families & newbies, but also challenging for experienced obstacle racers
  • Muddy obstacles and terrain
  • Over 30+ high quality obstacles, both natural and man-made.
  • Fun and challenging – suitable for all levels of fitness and age
  • Involves camaraderie and teamwork
  • Suitable for charities & fundraising
  • Water on the course is no deeper than 4-5′
  • Every entrant is chip-timed
  • Minimum age is 13 years (13-16 years must be accompanied by an adult 17+)
  • There are water stations on the course and in the event village
  • Professional medical attendance in the event village and on the course
  • Course health and safety checked
  • Every entrant will receive a Blast 2019 Nuclear Survivor medal and #MuddyMug with hot drink at the finish

Event Location: Kelvedon Hatch Secret Nuclear Bunker, Brentwood, CM15 0LA