Co-Decode: Sub Terra

By | March 20, 2019

by Co-Decode (website)

29-30 Morley St, Swindon SN1 1SG

Swindon

2-6 players

Languages: EN

60 minutes

In 2008 the Cheney potash mine was unexpectedly shut down and the site evacuated. Despite much speculation in the media at the time, the reasons for closure remained obscure and the whole event soon became overshadowed by the recession.
About a week ago, your team of investigative journalists received a cryptic answer phone message. The caller claimed to work for a scientific research company named R-Tech Group and requested an urgent meeting to share sensitive information about an earlier ‘mining incident’. You wait at the rendezvous point… but no one turns up.
Intrigued, you start digging into R-Tech’s recent activities and sure enough uncover a connection to the Cheney potash mine. Could there be a secret facility deep inside and, if so, what have they been researching? This could be your chance to expose something huge, so what are you waiting for?!
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Overall rating

Rated between 4 and 5 out of 5

based on ratings from 45 users
combined with 4 pro reviews

Your review

Player reviews

nosilamail experienced rated this:Rated between 4 and 4 out of 5
Team size: 4 Outcome: Successful escape!
value for money

Objective based rather than time so that always makes a good change

Team of 4, needed a couple of small nudges and a very kind one extra minute, to complete all objectives  

Good mix of puzzles and a few things not seen before

Nice use of a relatively small space  

Lived up to its reputation and well worth playing

Very enjoyable and great hosting 

Easy parking and smart building (lovely toilets!). 

ethanescapes rated this:Rated between 5 and 5 out of 5
Team size: 4 Time taken: 57:36
beautifulhi-techoriginal

This is a fantastic venue with a beautiful game - very well thought out and high immersion set design. The quality of this game really is 10/10.

David Jones rated this:Rated between 3.5 and 3.5 out of 5
Played: 28 Dec 2025 Team size: 4 Time taken: 58
value for moneyhi-techgreat hosting

7.5/10 

There was nothing especially special about this room. 

But for us it was pretty much the perfect escape room experience.  And what more can you ask for? 

First off we had a warm welcome and the  reception area and the themed toilets were impressive.

 I think it's a fairly new location. 

Even though it was a reasonably hi-tech room everything worked perfectly.

There were good signposts we were never short of things to do, never standing around agait "what do we do now?"

It was very immersive and engaging with a good range of puzzles, that all fit the theme. 

Including some low-level robotics which I feel could potentially be a growth area in escape rooms generally. 

I will say it was a surprisingly small space. 

I would recommend 3-4 people, any more it could  be tight but some of the puzzles seemed to need more than 2, although I'm sure they have a work-around. 

There was a kind of electronic video map which was the way we tracked our progress. 

One of the members of our group was worried about getting dirty because it was a mine, but there was no need to worry on that score, it was very clean, and thankfully it was well lit. 

So this particular group of 4 had recently done a room at Pier Pressure (Brighton) and Mindworks (Worthing) this escape room was a full £20 cheaper, for the same standard of room, which I think is noteworthy. 

I can totally understand why this room has been around the top of the Southwest list for as long as it has. There is not a great deal to get excited about around (or to the Southwest) of this area. 

Nothing that I can think of, certainly nothing in or around  Bristol. 

Which I always find surprising and disappointing in equal measure. 

It's in the city centre there's a car park right outside the venue. 

Overall I would definitely recommend this room. 

And I look longingly to companies such as this, to lead the way to a brighter future, for the UK Escape room scene. 

PapaRomeo118 rated this:Rated between 4 and 4 out of 5
Team size: 2 Outcome: Successful escape!
hi-techoriginalfamily friendly

A "mission" room, instead of a strict escape, with completion and bonus criteria.

The ingenuity of the puzzles is what stands out here; in a single game I can think of (but not name, to avoid spoilers) three gameplay elements which I've not seen in any other rooms.

It's probably best suited to 4 players, and is nicely parallel without being confusing, once past the initial stages.

Billa Babybel experienced rated this:Rated between 4 and 4 out of 5
Played: 16 Nov 2025 Team size: 4 Time taken: 51.10 Outcome: Successful escape!
original
OrangeLeek expert rated this:Rated between 4.5 and 4.5 out of 5
Played: 13 Jun 2021 Team size: 2 Outcome: Successful escape!
hi-techclevergreat hostingquite difficult

Something different and a lot of fun to complete. Such variety of puzzles and all so satisfying to solve

jim.lumsden rated this:Rated between 4 and 4 out of 5
Played: 18 Oct 2025 Team size: 4 Time taken: 42.02 Outcome: Successful escape!
beautifulimmersivegreat hostingquite difficult

Great room, probably the best in the city. The puzzles are satisfying and perfect difficulty. Good parallel paths and scalable objectives. 

However the best thing about it is a gorgeous and meticulous set. Brilliantly made and very immersive. 

Also, visit the loos they're awesome!

🦡cipherdelic virtuoso rated this:Rated between 4 and 4 out of 5
cleverfamily friendly
Fancy Chickens experienced rated this:Rated between 4 and 4 out of 5
bambam rated this:Rated between 4 and 4 out of 5
Played: 5 May 2023 Team size: 2 Outcome: Successful escape!
hi-techoriginalimmersivequite difficult

This was our first escape room and it set a very high standard! A really good variety of puzzles, which were logical and flowed well, with excellent staging and an interesting and unique story.

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Reviews by escape room review sites

We may have been the very last team to play Sub Terra in its original location; Co-Decode will be relocating to a more central spot in Swindon, and it’s not yet certain whether Sub Terra will be rebuilt there in quite the same form, or at all. But if you haven’t played it, you should be hoping it returns so that you can. [Edit: And I think it's now confirmed that it's coming back!]
The plot line has you entering a mine, supposedly abandoned but actually in use by a dubious corporation. Your job...
Sub Terra was a delight from start to finish. With a strong story that’s reenforced by a fantastic set, and great puzzles, it has firmly secured a place on my list of Top Ten Favourite rooms (to date). If you haven’t made the trip to Co-Decode yet, what are you waiting for?
A fantastic game bringing together great puzzles, impressive engineering, a beautiful set and an interesting storyline. Well worth travelling to Swindon for.

Sorry theme park enthusiasts this isn't a blog post or review about Alton Tower's Sub Terra ride. This is however a review for Co-Decode's Sub Terra escape room which we got to play at the weekend. Located 5 mins (Driving distance) from Swindon train station is this award winning escape room. They have two rooms here in Sub Terra and Professor Dunstan and the Search for the Ancient Statuette. We were here to play Sub Terra. You are investigative journalists looking into a tip about the mines being used for experiments and you are there to find the data that would reveal everything. Going into this room I knew nothing, not even that synopsis. I went in blind and I think that worked to my advantage.



Lists

This game is part of the following user-created game lists:
Best UK escape rooms 2022 by Escape the Review virtuoso
These are the 100 highest rated escape rooms in the UK, as of 31st Dec 2022, based on combined ratings from enthusiasts, bloggers and experts - every game here comes highly recommended. 
Best UK escape rooms 2025 by Escape the Review virtuoso
These are the 100 highest rated escape rooms in the UK, as of 31st Dec 2025, based on combined ratings from enthusiasts, bloggers and experts - every game here comes highly recommended.
Best UK escape rooms 2024 by Escape the Review virtuoso
These are the 100 highest rated escape rooms in the UK, as of 31st Dec 2024, based on combined ratings from enthusiasts, bloggers and experts - every game here comes highly recommended. 
Best UK escape rooms 2021 by Escape the Review virtuoso

These are the 100 highest rated escape rooms (out of 1600) in the UK, as of 31st Dec 2021, based on combined ratings from enthusiasts, bloggers and experts - every game here comes highly recommended. 

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