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Nuclear Races Rush

The ultimate obstacle racing weekend, taking place every May! Take...

Secret Nuclear Bunker Tour

Our self guided audio bunker tour is a fascinating opportunity...

High Ropes

Take on a high ropes adventure at our course where...

Nuclear Races Fallout

Tackle the winter race this November! Choose from our multi...

Nuclear Fit

Push your limits with Nuclear Fit, a unique outdoor fitness...

Halloween Trick or Treat

Halloween fun with more smiles than scares! Tackle muddy obstacles,...

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What's on

Discover what’s on at Nuclear Essex, from muddy obstacle races and fitness races to year-round activities including high ropes, obstacle taster sessions, axe throwing and more. Find outdoor activities and family days out in Essex, perfect for making memories together. Take a look below at a few highlights of what we have on.

Halloween Trick or Treat

Approx. 90 minutes

Themed Event

All Abilities

6
+

27th / 29th / 30th October

Get ready for a Halloween activity packed with mud, obstacles, treats and surprises. Take on Wild Forest’s muddy obstacles with a Halloween twist, climbing, crawling and balancing your way around the course while discovering trick-or-treat stops, halloween decorations and spooky surprises along the way.

Taking place earlier in the day, it’s a great choice for younger children, families and anyone who might be a little more nervous about Halloween – adults included! Expect mud, obstacles, treats and plenty of Halloween fun, with more smiles than scares.

Perfect for kids, teens, families and adults. Bring your friends or the whole family, buy 3 tickets and get the 4th FREE!

Fancy dress is absolutely encouraged – we just can’t promise it’ll stay clean!

 

Key information:

  • Hot washdowns and changing rooms available.
  • Hosted by highly experienced and qualified staff.
  • Fire pit available at the end.
  • Buy 3 tickets and get a 4th FREE!
£
27th October 10:30am and 3pm
£24.00  Per Person
BOOK NOW
£
29th October 3pm
£24.00  Per Person
BOOK NOW
£
30th October 3pm
£24.00  Per Person
Book Now
(Prices include booking fee)

Nuclear Fit

Fitness Race

All Abilities

9
+

May, July & September

Nuclear Fit is the ultimate outdoor fitness race designed to test you physically and mentally. This fitness race combines six 1km trail runs with intense workouts and fitness stations, like sled pulls and tyre flips. Don’t like running? Nuclear Fit Storm has all of the fitness stations, with none of the running. It’s a fresh alternative for those looking for a fitness race and to get outdoors.

  • Chip timing
  • Trophies for 1st, 2nd and 3rd male and female winners
  • Finishers Medal
  • Free for spectators and free parking
More info
(Prices include booking fee)

Nuclear Races Fallout

Muddy Obstacle Run

All Abilities

6K & 12K

14
+

7 November 2026

Tackle the Nuclear winter beast! Choose from our multi award winning 6K or 12K lapped course. Whether you’re a newbie, small group, big team, veteran or competitive endurance racer, Nuclear courses are thoughtfully designed to be challenging, fun and achievable for all ages and every fitness ability.

What’s Included

  • 40+ obstacles
  • Timing Chips
  • Survivor Medals for everyone
  • Water obstacles
(Prices include booking fee)

High Ropes

Approx. 2 Hours

Activity

All Abilities

6
+

Available All Year

Ready to leave the ground behind? Our High Ropes adventure is a thrilling, sky-high experience that will test your nerves, challenge your balance, and leave you buzzing with adrenaline.

You’ll navigate suspended bridges, swinging platforms, rope crossings, and zip wires up to 8 metres above the forest floor as part of our High Ropes course.

Whether you’re conquering fears or chasing fun, every step is a chance to prove what you’re made of.

What’s Included

  • 3 different levels
  • 6 different courses
  • 40m long Final zip wire
  • Over 70 Aerial obstacles
£
High Ropes
£24.00  Per Person
(Prices include booking fee)
Book Now

Secret Nuclear Bunker Tour

Allow 1 Hour

Activity

0
+

Available All Year

Take a step back in time to the Cold War era with a visit to the Kelvedon Hatch Secret Nuclear Bunker. This massive underground complex is the biggest and deepest Cold War bunker open to the public in the Southeast of England.

As a Regional Government Headquarters, the bunker would have housed hundreds of staff, including Prime Minister Margaret Thatcher. Our self guided audio bunker tour is a fascinating opportunity to explore this unique piece of history and discover the secrets that would have unfolded in the event of a nuclear war.

What’s Included

  • Immersive Self guided tour with handsets
  • Discover real life artefacts from the Cold War period, and experience what life would have been like at the Essex Secret Bunker.
  • Discover the authentic underground command centre – where real plans were made for life after a nuclear strike.
  • Younger visitors can explore this unique era of our history through our engaging dressing up area.

Nuclear Races Rush

All Abilities

4
+

8th May / 9th May

High Ropes

  • Approx. 2hrs
  • Age 6+

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What's Included
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£24 per person
Minimum of 2 people
Book Now
High Ropes

Little Monkeys

  • Approx. 1hr
  • Age 6+

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What's Included
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  • Soluptatio to modita autetus daercius dem qua
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£24 per person
Minimum of 2 people
Book Now
Little Monkeys

Quiet Sessions

  • Approx. 1hr
  • Age 6+

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What's Included
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  • Soluptatio to modita autetus daercius dem qua
  • Soluptatio to modita autetus daercius dem qua
£24 per person
Minimum of 2 people
Book Now
Quiet Sessions
Features

What to expect

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Facilities

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What to wear

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Supervision

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About You

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Safety

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Special Events / Add-ons

FAQ's

What should I wear?
Wear closed toe, flat, sturdy shoes, trainers are ideal. Remove all jewellery. Glasses will need to be held on with a retainer, if you don’t have one you can borrow one for a returnable deposit. Thin layers (t-shirt, long sleeve top, fleece etc) are best – you can aways take a layer off or add another. Bring a waterproof with you. Although some of our courses are amongst the trees there’s lots in the open air too. You’ll get warmer as you take on our aerial ropes, obstacles & challenges.
More Info...
What is the Big Drop, and how do I add it to my booking?
The Big drop is our 50ft fan descender and can be added to your booking at checkout or once on site.
Is there an instructor or are we on our own?
Your journey will start with and safety brief with one of our trained instructing team. Once on the course your safety will be monitored by the team from the ground. In the event that you need support on the course we can access the course if necessary.
Can adults and children go on the course together?
All participants follow the same journey and all members of your group will stay together throughout.
Is there somewhere to store belongings while I'm taking part?
We have lockers on site that are free to use during your time with us.
Can I do more than one activity in a day?
We have a range of activities available and offer 15% Off any bookings that include 2 or more Nuclear Adventure activities
Can I reschedule my session?
Sessions can be rescheduled without charge, we must have a minimum of 48hrs notice and multiple changes are prohibited. To reschedule your booking please use the Manage my booking link in your confirmation email.
Do I need to complete a waiver in advance?
Yes, all participants will need to complete our Risk Acknowledgment and Disclaimer before you arrive. The lead booker will receive a link to these with their confirmation email and will be asked to forward them to everyone participating
Can we arrive without a booking?
Our activities begin at set times and have a maximum capacity. While you are welcome to ask at reception and check availability you may find you have to wait for our next availability. We always recommend booking in advance so you can guarantee space on your preferred session.
Can children stay on the lower levels?
Our course is split into 3 height levels. All participants will start on our lower practice level. We believe in challenge by choice and will never force guests to do more than they are comfortable with. Due to the gradual change in height we often find that participants surprise themselves by going higher than they thought they would. If however children reach their limit on the lower levels they are free to stay on the lower level and try our challenges to continue to stretch themselves.
One of our booked participants can no longer make the session, can we replace that booking/waiver with someone else?
You are welcome to bring another person along with you. You must amend the participants name using your booking portal and have them complete a new Risk Acknowledgement and Disclaimer.
Can I add additional people to my booking?
Yes you can book additional participants to your session online providing there’s availability (you can check online) or to avoid disappointment get in touch with us before you arrive adventures@nuclearessex.com.
How long before our session do we need to arrive?
Your session will start at the time you have booked, we ask that all participants are on site a minimum of 10 minutes before your session time to sign in and use the facilities.
Can I wear glasses?
You can wear glasses when climbing but a retainer must be worn. Bring one or hire one at the cabin on the day (£5 refundable deposit).
I am disabled, can I join in?
We aim to be fully inclusive and will do everything we can to help disabled clients participate.
More Info...
Are dogs allowed?
Well behaved dogs are welcome in our picnic area and activity areas; however, they must remain on a lead while visiting.
What happens if the weather is bad on the day of my activity?
Nuclear Adventures is an all-weather outdoor experience. We stay open in most conditions, but extreme weather may affect your booking.
More Info...
What happens if I fall?
Your safety equipment will prevent you from falling far, so if you do slip off an element, you will be quite safe while you climb back on and continue on your journey. If you can’t manage to climb up without help then one of our crew will be happy to talk you through and help you out.
I'm afraid of heights, can I still participate?
Yes! We’ll prepare you first and support you throughout. Many people surprise themselves and overcome their fears.
More Info...
Do I have to be fit?
A degree of personal fitness is required to complete our courses and we would ask you to be honest with yourself about your level of fitness. You can take a breather after each section and of course you can choose to do just some of our 6 sections each time you visit.
Are there any weight restrictions?
The maximum weight for taking part in our High Ropes and Zip Trek course is 120kg
Do I have to remain on site?
A responsible adult (over 18) has to remain onsite at Nuclear Adventures at all times while children under 18 take part in our sessions. Responsible adults must be in visual contact with children under 18 at all times to support them from the ground and supervise behaviour. An adult must sign waivers for any youths aged 18.
Do I need to participate with my children on the High Ropes?
It depends on your child’s age and ability — some children must be accompanied by a paying adult, but participation isn’t always required.
More Info...
How old do you need to be for the High Ropes Activity?
The minimum age for the high ropes course is 6 yrs and participants must be 1.20m tall. Adults will need to participate to supervise 6-7yr olds. Ratio of 1 adult to every 2 children so you can help them with the safety system and avoid them becoming over tired and frustrated. Of course, we encourage parents to join in with their children too, turning it into a family fun activity!
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current activities...

Halloween Trick or Treat

Wild Forest
Halloween fun with more smiles than scares! Tackle muddy obstacles, collect treats and enjoy spooky surprises. Perfect for kids, families and adults.

High Ropes

Adventures
Take on a high ropes adventure at our course where you’ll navigate exciting aerial obstacles and zip lines high in the treetops!

Illuminated

Adventures
Experience the thrill of High Ropes at night! Open to ages 6+, this illuminated ropes course offers a unique evening adventure under the lights.

Secret Nuclear Bunker Tour

Our self guided audio bunker tour is a fascinating opportunity to explore this unique piece of history and discover it's secrets.

Halloween Blackout

Wild Forest
Brave the obstacles after dark! Ages 10+ can grab a headtorch and tackle our muddy course, where darkness makes every obstacle a new challenge.

Zip Trek

Adventures
Soar through the air on a series of breathtaking zip wires as you navigate a 500-metre course through the canopy. Fun for children and adults.

Axe & Knife Experience

Adventures
Ready to hit the bullseye of our axe throwing range? Test your skills on our three lane, multi target range!

Big Drop

Adventures
Looking for a high adrenaline add on to your High Ropes or Zip Trek experience? If so, the Big Drop is perfect for you!

Obstacle Taster – 2K

Wild Forest
A fun, beginner-friendly 2K with 10–15 obstacles, mud and plenty of laughs. Perfect for all abilities, ages 6+.

How to find us

Nuclear Essex 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.

Interactive Map

our next races...

Nuclear Fit

Push your limits with Nuclear Fit, a unique outdoor fitness race designed to push you physically and mentally. This fitness race combines six 1km trail runs with intense workouts and fitness stations, like sled pulls and tyre flips. Races every May, July and September.

Nuclear Races Fallout

Tackle the winter race this November! Choose from our multi award winning 6km or 12km lapped course. Whether you’re a newbie, small group, big team, veteran or competitive endurance racer, our course is designed to be challenging and fun for all ages and every fitness ability.

Nuclear Races Rush

The ultimate obstacle racing weekend, taking place every May! Take on 6km of award-winning obstacles and epic mud, or push yourself further with the 12km challenge. Plus, with 1.5km, 3km and 4km courses for children and families, there’s a race for everyone.
What's on this half term
Find out more

Nuclear Offers

Kids Go Free this October Half Term

Make this October half term one to remember! Book your tickets today and enjoy one free child admission with every full-paying adult.

Nuclear Fit group offers!

We’re inviting gyms, bootcamps, corporate teams and fitness communities across the country to partner with Nuclear Fit.

15% Off Hotel accommodation

Whether you are taking on a muddy obstacle course, ziplining through the trees or doing multiple activities, the Holiday Inn Brentwood M25, Jct. 28 is your ultimate basecamp.

Bunker Group Discounts

Gather your allies for a deep-dive into Cold War history. Secure entry for your group at our special tactical rates:

EARN THE TREBLE FIT MEDAL: Complete All Three Nuclear Fit Events

Three events. One elite medal. Consistency never looked so good.

MUD TRIBE TEAM REWARDS: £50 Voucher & FREE Race Ticket!

Gather your tribe! Book a 5km team wave with 20+ members for a £50 Nuclear Voucher, or hit 30+ for a free race ticket.

10% OFF Group Bookings: Mobilise Your Nuclear Adventures Team

Secure a single booking for 20 or more participants in Nuclear Adventures standard activities and automatically take 10% OFF the total cost.

FREE Birthday Child Space: The Ultimate Nuclear Adventure!

Book an adrenaline-fueled Nuclear Adventures party (10+ participants) and the Birthday Child's space is completely FREE!
View All Offers
What's on this autumn
Find out more

How to find us

Nuclear Essex 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.

 
Interactive Map

NUCLEAR Adventures

Secret Nuclear Bunker, Kelvedon Hatch
Brentwood, Essex, CM15 0LA

NUCLEAR Essex HQ

Nuclear Fit, Great Myles, Kelvedon Hatch
Brentwood, Essex CM15 0LB

Event Village

Secret Nuclear Bunker, Kelvedon Hatch
Brentwood, Essex, CM15 0LA

Secret Nuclear Bunker

Secret Nuclear Bunker, Kelvedon Hatch
Brentwood, Essex, CM15 0LA

Nuclear Wild Forest

Parsonage Farm, Kelvedon Hatch,
Brentwood Essex, CM15 0LA

wildforest@nuclearessex.com

07970 739037

NUCLEAR ESSEX

Great Myles, Kelvedon Hatch
Brentwood, Essex CM15 0LB

Nuclear Wild Forest

Nuclear Wild Forest, Site B, Parsonage Farm, Ongar Rd, Kelevdon Hatch, Brentwood, Essex, CM15 0LA