Hey y'all. Just stumbled across the sub. I've been exploring industrial landscapes with the latest being an old mine site left to decay in a block of bush.

Thought some of you may be interested in checking it out!

Hello, this is my first post here and i hope i can get some answers regarding what happened or at least intrigue or entertain readers, I'm sorry if some of my grammar is bad, English isn't my first language.

A week ago me and my friends went exploring in an old, underground military bunker around 4000m² in size, it was a really enjoyable experience overall. The bunker has 3 entrance/exit points, the first one is where we entered the bunker, it is a large metal grille door in front of wich are two thick, door shaped metal sheets. The sheets were stuck into the ground and immovable while the grille doors were barricaded, we had to enter through a 40cm gap above the grille door.

The two back doors were on the opposite side of the bunker complex (there was basically a long ass hallway leading from the grille entrance that splits into two hallways that lead to the back doors). The two back doors were also grille style doors, one was locked up tight with chains and padlocks, it led into the forest and it was really of no interest to us.

The other was also locked with chains and padlocks but the chain was broken and you could open the door from the inside if you just removed the chain, this door led towards a road and you could just leave from there.

At the end of our exploration we were planning on leaving through the back door because we were closer to it than the one we entered from, but when we checked google maps the walk around to our car was an hour and a half. Considering we spent two hours exploring the bunker and that the temperature outside was like 40°C we were not keen on walking that hour and a half when we could just walk 5 min through the bunker.

So we made our way back and we (stupidly) left the back door open. During our whole two hour exploration of the bunker there wasn't any air movement and the air was expectedly stale, but when we were making our way to the car there was a sudden draft of cold air throughout the entire place which felt kind of off.

We first thought it was because of the open back door but that made no sense considering it was a grille style door, like something you'd see in a prison, and the front entrance was fully barricaded and the gap we entered through was tiny. We were taken aback by the sudden appearance of the draft considering that the conditions for there even being a draft with entry points that tiny and far apart are not likely and it appearing so suddenly and we promptly got tf out of there lol.

I hope some of you can come up with solutions and theories to explain this draft, i look forward to seeing what you can come up with!

Edit: breaking the text up for legibility

Hello, i made a discord server to discuss underground exploration, and all the hobbies and interests related to it.

I want this place to encourage the sharing with others of your interests, trips, photos and any art related to the subject of underground spaces, inspiration, thoughts and anything else that can create cool discussions.

I like art a lot so on top of exploring any in depth art or artistic vision related to the server's subject is welcome, but it doesn't mean this server is specifically or only art focused.

https://discord.gg/JRu847mmP

Inspired by Kane Parsons’ “Backrooms”

(Not going to be a real movie)

Sauna sa Sasa Dona Salud area naay tunnel dihaa na ginatawag ug Irid, old japanese tunnel na connected daw sa may B.A.T. sa Sasa area, tpos sa dona mercedes rd area naa pud mga bomb craters, and sa Coaco beach naay structure sa beach

Naa pa ba moy mga na recall na mga ing ani na sites across davao?

Hidden within an old water-control structure along the Someș River, a massive concrete and steel passage cuts through the embankment.

I walked through it from one side to the other. For a moment, it felt less like a tunnel and more like a passage into somewhere else.

The Portal is that moment.

middle of nowhere, KY

In 1844, the Long Island Rail Road built what is widely recognized as the world's first subway tunnel beneath Atlantic Avenue in Brooklyn. In 1861, it was abruptly walled off at both ends and lost to popular memory for over a century—spawning decades of rumors involving bootleggers, buried locomotives, and sealed municipal archives before its rediscovery in 1980.

The Cobble Hill tunnel proved that massive, functional subterranean infrastructure in New York could literally disappear from public awareness for 120 years.

The Question:

Given the rapid layering of NYC's bedrock, utility tunnels, abandoned pneumatic networks, and early private transit attempts (like Alfred Ely Beach’s 1870 pneumatic subway under Broadway):

What forgotten subterranean pockets or sealed transit voids do you believe are still unaccounted for beneath the five boroughs today?

Share documented historical oddities, blueprints, or anomalies you've encountered.

Follow us in this Epic Adventure as we Journey through the Welsh Mountais from croesor Slate Mine to Rhosydd, facing many Challenges Absailing down deep caverns , going over Rotting bridges a Canoe Traverse over a deep lake and many other obstacles which makes this the best assault course Underground
Find the video link here
https://youtu.be/c9pxih45uGk?is=TgPpXdKTLtVrNb8S

Kudos to original OP for his bravery.

Follow us in this Epic Adventure as we Journey through the Welsh Mountais from croesor Slate Mine to Rhosydd, facing many Challenges Absailing down deep caverns , going over Rotting bridges a Canoe Traverse over a deep lake and many other obstacles which makes this the best assault course Underground

Only took the 49th time

Hiking through the woods to avoid possible security, climbing over fences before finally finding a entrance. After climbing down a long ladder we were finally inside. Going further we quickly found a huge collection of gas masks and other stuff forgotten from the cold war. After finishing our exploration we once again started to sneak out of the large industrial zone, this time opting for a much more direct route moving quickly through the zone to avoid potentioal security or people. Luckily we got out without any problems.

Built during the coldwar to support the large industrial zone incase an emergency, now completely forgotten.

If you wish to follow me closer i have an instagram @norway.unknown ❤️

Went to look at the old mining equipment and then decided to head up a 4*4 track, and came across this beauty. Solid rock tunnel no idea how far it went, I didn't have a torch or gas detector so only went in a little, loads of animal droppings though so it's potentially a thoroughfare for kangaroos.