Nuclear Rush
Prepare for the ultimate muddy obstacle course race at Nuclear Rush. Choose your challenge on our 6k or 12k courses; there’s over 40 obstacles on our 6k course and over 70 obstacles on the 12k course, including our famous Deathslide and para-plunge zip lines. Our exciting courses are designed to test every fitness level, whether you’re a beginner, a seasoned mud racer, an individual, Rookie or family. This event is a must-do race!
9th May 2026
Adult Races
Rush - 6K
- Approx. 2 hours
- Age 13+
The 6 km course takes you through muddy farmland, woodlands and lakes, and is complete with approximately 40+ obstacles to test your determination, agility and adventurous spirit.
Set in the heart of the Secret Nuclear Bunker Estate in Essex, and while challenging, it’s open to participants aged 13+ (adult accompaniment required for 13 – 15 year olds) and welcomes all fitness levels.
You’ll be chip‑timed and receive a finishers medal, but there’s no penalty for skipping obstacles, meaning that you can enjoy the experience and take your race at your pace.
- 40+ obstacles
- Hot washdowns
- Changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free finishers photo
- Free bag drop
- Chip timing
Current Price: £69.88
(Price Includes Booking Fee)
13 – 15 year olds must be accompanied by a paying adult
Rush - 12K
- Approx. 2 hours
- Age 16+
Double the distance, double the challenge. Test your limits on the full 12km course and every world-class obstacle.
Taking you deep into muddy farmland, woodland and lakes on the imposing terrain of the Secret Nuclear Bunker Estate in Essex, the 12km races offers over 70 obstacles and a true endurance feel for those ready to push their limits.
With chip‑timing, high‑quality, achievable natural and man‑made obstacles and no penalty system (you can attempt as many or as few obstacles as you like), it’s built for both seasoned racers and adventurous newcomers alike.
- 70+ obstacles
- Hot washdowns
- Changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free finishers photo
- Free bag drop
- Chip timing
Current Price: £80.63
(Price Includes Booking Fee)
Rush Oblivion Storm - 38K+
- Approx. 8.5 Hours
- Age 18+
- Advanced
Not for the faint‑hearted, the Rush Oblivion Storm is designed to challenge the fastest and fittest obstacle race athletes, it’s a brutal challenge.
New for 2026: Rush Oblivion Storm will now include Nuclear Fit Storm!
Start at Nuclear Fit Storm for one lap of the 6 functional fitness stations then join the main obstacle course to complete lap one (c2km of obstacles). You need to complete a further 3 laps of the main obstacle course to receive your Oblivion Storm medal.
This race requires hardcore training to gain your title, overcoming a physical and mental test of endurance, strength and skill.
- 70+ obstacles
- Chip timing
- Free finishers photo
- 38km distance
- Complete 4 laps to receive an Oblivion medal
£165.00 Per Person
(Price Includes Booking Fee)
Oblivion Mentor
Michael Greenslade is the Nuclear Races Oblivion Mentor.
As a fully qualified PT, an instructor at Wild Forest and with experience of racing at Nuclear Races, including the inaugural 42K Oblivion race in 2015, he has first hand knowledge to share with you.
Michael has also completed full and half Ironmans, ultra runs with challenging elevations and is a regular open water swimmer.
A weekly training plan will be available with top tips on nutrition to prepare you for this ultimate challenge.
Additional features
- Exclusive start time (8am).
- Chip timing: either competitive or non-competitive, YOU decide!
- Exclusive transition zone.
- Pit Crew (max 2 people per runner) welcome at Transition Zone.
- Oblivion personalised running vest.
- Oblivion 2026 medal for those who complete 4 laps.
- Nuclear Rush medal for completing less than 4 laps.
- Private Oblivion Facebook support with regular training tips, training plan information and Mentor.
- Priority at all obstacles.
Important Information
- This is a lap race.
- 1 lap = 12K and 70+ obstacles.
- Exclusive start time (8am).
- Chip timing: either competitive or non-competitive, YOU decide!
- Every entrant will receive an email 2 weeks before the event to confirm if they will run as a competitive runner or for personal completion.
- Competitive runners will have a secure band which must be displayed at all times.
- Competitive runners will have a minimum of 5 compulsory penalty obstacles which must be completed (multiple attempts allowed). If not successful a penalty bear crawl must be completed to ensure you keep your competitive band (Marshals will have the power to remove bands for non-completion).
- Runners entering for personal completion will not be given a band and will not be required to complete the penalty bear crawls.
- All runners both competitive and non-competitive must make genuine attempts at all obstacles.
- Competitive runners can be disqualified from the competitive ranking and have bands removed for avoiding any obstacle.
- The race will finish after 8.5 hours.
- Runners will be unable to start their last lap after 2pm.
- We will start clearing the Oblivion course from 4.30pm (last runner first).
- If you are running competitively it is your responsibility to report to chip timing on completion of your race to show your band (why not show your band in your Survivor Wall photos for bragging rights?).
Family and Children RACES
Create unforgettable memories and embrace active adventure together with the Family and Rookie Rush. Designed for all abilities, this course offers a fun, supportive environment where the whole family can tackle exciting obstacles, get wonderfully muddy and celebrate every accomplishment. It’s the perfect way to spend quality time outdoors, empowering the next generation to embrace an active lifestyle and build self-confidence.
RUSH ROOKIES - 1.5K
- Approx. 1 Hour
- Age 4+
The first muddy step! A single lap of the 1.5km fun course, built just for the youngest adventurers to conquer the mud.
Rush Rookies is the perfect introduction to obstacle racing for children and teenagers, designed for ages 4 – 14. The course is shorter and more manageable than adult races, but still packed with mud, water, climbing and crawling challenges that are fun and safe.
Young participants can tackle obstacles at their own pace, with an emphasis on enjoyment, confidence‑building and teamwork rather than speed.
Each Rookie finisher receives a medal, giving them a sense of achievement and a memorable first taste of the adventure that Nuclear Races offers.
- 25+ obstacles
- Hot washdowns
- Children's changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free downloadable certificate
- Free finishers photo
- Free bag drop
- Chip timing
Current Price: £31.71
(Price Includes Booking Fee)
4 – 7 year olds must be accompanied by an adult spectator – free of charge, must arrive with the Rookie.
RUSH ROOKIES - 3K
- Approx. 1.5 hours
- Age 9 - 14 year olds
The next step up for young racers aged 9–14, Rush Rookies 3km is for those who are ready for a more challenging and adventurous obstacle experience.
Covering a longer and slightly tougher course than the standard Rookies, it features mud, water, climbing, crawling and more complex obstacles to test balance, coordination and stamina in a safe, supervised environment.
Participants tackle the course at their own pace and every finisher receives a medal, giving them a sense of achievement and a taste of the bigger, Nuclear Races ahead.
- 50+ obstacles
- Hot washdowns
- Children's changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free downloadable certificate
- Free bag drop
- Chip timing
- Free finishers photo
Current Price: £34.39
(Price Includes Booking Fee)
One free supporting adult per Rookie, must arrive with the Rookie.
RUSH ROOKIES PRO - 3K
- Approx. 2 hours
- Age 9 - 14 year olds
For Rookies looking to challenge themselves further, Rush Rookies Pro is designed for competitive young racers who are ready to test their strength, skill and determination.
Completing two laps of the 1.5km course, the main difference with Rookie Rush Pro is that all obstacles are mandatory. Not able to complete an obstacle? Then you must perform 10 chest-to-floor burpees before moving on!
A true test of grit and determination for ambitious youngsters eager to rise to the challenge!
- 50+ obstacles
- Hot washdowns
- Children's changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Qualifier for OCR European Champs and OCR World Champs
- Finishers Medal
- Free downloadable certificate
- Free bag drop
- Chip timing
- Free finishers photo
- Trophy for winning male and female
Current Price: £40.40
(Price Includes Booking Fee)
RUSH Family - 1.5K
- Approx. 1.5 hours
- Age 4+
The ultimate family muddy adventure! Designed for families looking to enjoy a fun, inclusive obstacle experience together, Rush Family 1.5km covers a short and manageable distance.
The course features mud, water, and playful obstacles suitable for both children and adults. The focus is on teamwork, laughter and shared adventure rather than speed or competition, making it perfect for introducing younger participants to the thrill of obstacle racing.
All finishers receive a medal, creating a memorable experience for the whole family to celebrate together.
- 25+ obstacles
- Hot washdowns
- Children's changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free downloadable certificate
- Free bag drop
- Chip timing
- Free finishers photo
Current Price: £31.71
(Price Includes Booking Fee)
4 – 15 year olds must be accompanied by a paying adult
RUSH Family - 4K
- Approx. 2 hours
- Age 10+
Turn the fun up a notch with the longer family course of 4km with more obstacles – the perfect way to build resilience together!
The Rush Family 4k wave is perfect for families seeking a more adventurous day out together. Covering a longer distance, it features a mix of mud, water, climbing and crawling obstacles that are still family-friendly and suitable for a range of ages and abilities, including the deathslide.
The emphasis is on fun, teamwork and shared achievement rather than competition, allowing parents and children to tackle challenges side by side. All finishers receive a medal, creating a rewarding and memorable experience for the whole family.
- 35+ obstacles
- Hot washdowns
- Children's changing facilities
- Buoyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free downloadable certificate
- Free bag drop
- Chip timing
- Free finishers photo
Current Price: £40.85
(Price Includes Booking Fee)
10 – 15 year olds must be accompanied by a paying adult
Nuclear Offers
Award winning
Award‑winning obstacles on a permanent course, in a farmland setting including mud, woods, rivers and lakes.
Signature obstacles
Iconic signature obstacles, including the 20‑foot Deathslide, Travelator and a 15‑lane zip‑wire into water.
Races for all
A range of races which are inclusive of all fitness levels, abilities and ages.
Group and team friendly
Perfect for groups and teams to participate together and also offers the perfect opportunity for raising money for charity.
Event village
Friends or family can watch the race, enjoy music, food, drinks and merch in our spectator friendly event village while the action happens nearby.
Varied courses
Varied distances and formats including beginner friendly options.
TOP 10 FAQ's
How to find us
Nuclear Races is located in Brentwood, Essex just 15 minutes from the A12, M25 and M11.
By Train and taxi, we’re just 15 minutes from Brentwood station (on the mainline from Liverpool St) or 15 minutes from Epping Underground station.