On my trip to Copenhagen to ski (see separate article, alt. link) I also wanted to go underground. Sadly, Danish caves are in short supply, only on a remote island Bornholm. However, there are bunkers... while my visit first was going badly, it turned out to be a spectacular success! Not only did I get an in-person tour of the bunker, but I also got visit a secret sea shore beach from the bunker's under-the-cliff exit, and also got to see small sea caves!
I wanted to visit the Cold War museum at Stevnsfort, about an hour's drive south from Copenhagen. At first the visit was about to go wrong, as their bunker visit was only open for tours, and the next tour would leave so late that I wouldn't be able to get back to the airport in time.
However, probably seeing my desperation, they managed to come up with a personal tour just for me, with a super expert guide Stein. Thank you!
We walked first on the surface to look at radars, guns and the general layout of the bunker. There's 2 kilometers of tunnels underground. The facility was built starting from 1953 and extended and used until the 2000s.
The bunker was both an intelligence gathering station for tracking foreign adversary's ships and communications, but also a defense facility with large underground guns, ammunition depots, and personnel facilities. The different parts of the underground tunnel network were connected by a long tunnel which then branched off in a different directions for various functions.
One of the tunnel branches led to the sea, opening up a door right at the bottom of the massive cliff facing the sea. This area is by the way known for the layered chalk- and limestone and a tiny darker layer in between, indicating the soot and ash from the meteorite impact 66 million years ago that likely killed off the dinosaurs.
As we exited to the sea front, there was a small pier and a gravel beach few meters in front of the cliff. At the bottom of the cliff there were several areas that seemed to have smaller cavities, further out maybe even larger caves. But I was unable to exit the small beach area as the beach was protected by the cliffs reaching out all the way to the water.
Right next to the bunker exit was one of the small cavities under the cliff. It formed a roof above the beach, about 5 meters deep and 13 meters wide, very low but at the highest point on the lip about 2.8 meters tall. Let's call this a small cave! Or maybe not, your call, but in Finland we would have been glad to have such a roof on a cliff. Anyway, I also scanned this possible cave with my lidar-enabled iPhone. You can see the form of the cave in the pictures below, there's also the 3D model, rotate-on-your-browser version, and a map schematic about the cave shape.
The museum office for the bunker and fort is at N 55.26460 E 12.40980. The main bunker entrance is at N 55.26436 E12.41554.
The cave is at N 55.263283 E 12.416556.
Museum:
Bunker:
Cave and the beach:
This article has also been published at Theurbanexplorer.net here. Read the full Planetskier series at planetskier.net, urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net, or all blog articles from Blogspot. Photos and text (c) 2026 by Jari Arkko. All rights reserved.
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