It’s the Spookiest Time of Year — Manunka Chunk Tunnels (GC82B5) — Geocache of the Week

The entrance to the tunnels. There may or may not be zombies inside. Photo by geocacher DeadColdHands
The entrance to the tunnels. There may or may not be zombies inside. Photo by geocacher DeadColdHands

Geocache Name:

Manunka Chunk Tunnels (GC82B5)

Difficulty/Terrain Rating:


Why this is the Geocache of the Week:

As the end of October nears and Halloween draws close, the air has a certain chill to it. The trees turn into skeletons of their former selves. At least, for me, Halloween is one of the best times of year and always puts me in the mood to visit spooky or haunted places. The Manunka Chunk Tunnels in New Jersey have been abandoned since sometime in the early 1900s—well, let me clarify: abandoned from their intended use. Intrepid urban explorers and geocachers have been visiting these tunnels for years. In order to earn your smiley, you’ll have to summon loads of bravery, don a sturdy pair of mud-proof boots and journey through darkness. Sounds like a perfect fall adventure to me!

# of Finds:


# of Favorite Points:

117, which makes it the most favorited geocache in New Jersey.

What geocachers are saying:

“Manunka Chunk Tunnels” still the most memorable and amazing cache we’ve ever found!” – The Brigadier

“This was, by far one of my favorite caches to date.” – pumpkinking27

“Great cache! Awesome place!” – cuteynewt

Read More Logs


Click to see all of the photo logs.


The final stretch of the tunnel. Photo by geocacher doug-up


Inside the tunnel. Try not to get too creeped out! Photo by geocacher doug-up
A brave crew of geocachers after making the find. Photo by geocacher TeamBandN

What’s the spookiest place a geocache has ever taken you? Tell us in the comments.


Continue to explore some of the most engaging geocaches around the globe. Check out all the Geocaches of the Week on the Geocaching blog.

If you would like to nominate a Geocache of the Week, leave a comment below with the name of the geocache, the GC code, and why you think we should feature it.

Extra special shoutout to Lord Stirling for the recommending this geocache for Geocache of the Week!

  • Joekirr

    My 1000th find. We had 26 cachers plus 3 geodogs on our excursion on 7/14/13. Some from that group went back again in September. Well worth a trip to find it.

  • BrianSnat

    Great cache. I’ve been there with several other groups after I found it just to experience the tunnels again. One of the neat things about it is that after slogging through shin deep mud and knee deep water and clambering over piles of boulders, you emerge at the cache site which is an almost Jurassic Park-like world with the steep, moss covered rock walls. It’s a very surreal experience. If you live within a few hours drive it’s worth the trip.

  • jdseaman

    That tunnel was one of the epic civil engineering achievements of the 19th century in the race to create a route for PA coal to NY ports. A lot of political and business intrigue went into building it. The tunnel was commissioned by John Blair for whom Blairstown is named, and was officially abandoned in 1970 although it saw increasingly little use after 1910 once the Lackawanna cutoff was opened. The Manunka Chunk tunnel was a major maintenance problem for the railroad because of water.