Skip to content


Secret Underground Tunnel

A cache by Sirhcoey Send Message to Owner Message this owner
Hidden : 01/31/2009
4.5 out of 5
4 out of 5

Size: Size:   regular (regular)

Join now to view geocache location details. It's free!


How Geocaching Works

Please note Use of services is subject to the terms and conditions in our disclaimer.

Geocache Description:

A secret underground tunnel in the middle of a jungle that goes on and on.. How old is it? Who built it? What is it for? Where does it lead? Explore and see for yourself! * A terrain difficulty 4 cache for die hard geocachers only! *


* The shortest way to get to the entrance is via the road from the south, but the more interesting and original way to the entrance is via the north. There is no need for any bashing or climbing! Instead, follow the clearings and trails. If you see a staircase, you're on the right track, and the coordinates should bring you right to the entrance.

* No lights, no cellphone reception, and no one can help you if anything goes wrong, so do not enter alone! Minimum two to cache, and make sure you tell someone else where you're going.
* Bring two flashlights per person for insurance. The more light the better.
* The forest has conspired to make sure the cache entrance is hard to find. Follow these clues and rely on the GPS to make it there.
- If you are coming from the north, lampost 19 is the closest entry. Follow the pipe till no. 40. and you should find a staircase leading to a trail.
- you are looking for a small hole in the ground. Seriously!
- the GPS coordinates are correct. - the hole in the ground is hidden by dense palm and short bushes, and is in the shadows. This place really doesn't want to be found!
- near the GZ, there is only one such thick clump of palm bushes. You would notice that the rest of the forest is fairly clear. Go around and find a way in. it's in there!
* At the entrance, a little climbing is required, but a rope is helpfully attached.
* The entrance has a whole bunch of forest geckos that like to jump down on you from the ceiling - so be warned! Those egg cases are lizard eggs.
* Be prepared to get your shoes muddy.
* Having said that, walking on the pipes will save you from a lot of mud.
* Cache is a medium/large sized container and is hidden somewhere pretty obvious (for a geocacher) in the tunnel. For the full challenge, don't read the clues, and use your geosenses. But go ahead and decipher Clue 1 to narrow the search if you don't want to poke around too much.
* It's still a mystery who built this place for what purpose and when. Feel free to post your theories in your log.
* Keep this location a secret! Any publicity will jeopardise the existence of this location. Preserve it for the enjoyment of future geoexplorers. Please do not post the coordinates elsewhere on the internet.
* Do bring some nice swag to reward the next cacher for making it!

A warning if you are afraid of the dark, lizards, mud, small confined places, or the unknown. Have a great adventure and happy geocaching!

### *Postscript: 16 Dec 2016* ###

- This cache was mentioned in the 13 Dec 2016 Geocaching HQ newsletter, as part of the announcement for the new Singapore Country Souvenir
- To learn more about the history of this place, see this log: (visit link)

Additional Hints (Decrypt)

Pyhr 1: Bar bs gur Cvcr Onlf
Pyhr 2: Onl Bar

Decryption Key


(letter above equals below, and vice versa)

Reviewer notes

Use this space to describe your geocache location, container, and how it's hidden to your reviewer. If you've made changes, tell the reviewer what changes you made. The more they know, the easier it is for them to publish your geocache. This note will not be visible to the public when your geocache is published.