"It all started when five cave enthusiasts began exploring what looked like not much more than a hole in the ground. Around a year later they have managed to reach 150 metres into the previously unexplored cave.
"In some places in the roof there are several square metres of stalactites," cave enthusiast Alexander Bennerstål told the TT news agency on Monday after Swedish radio first reported the discovery. "We have not measured all parts of the cave, so it is probably bigger than that. It's mostly a narrow passage where we are on our stomach or side, crawling, and sometimes you just about manage to push your chest through.""
More:
http://www.thelocal.se/20160829/swedes-find-secret-150-metre-long-cave