Salo, southern Finland. More than an hour away by car, and we've been in the forest for an hour now. The cave is nowhere to be found. I have coordinates, but in the wrong coordinate system and Google isn't co-operating to interpret them in the right way.
Finally, however, Janne sees the cave as we walk in circles in the hills in the forest.
Rosvoluola [1,2], or the smuggler's cave, turns out to be interesting. Once again we find ourselves in a cave that is large by Finnish standards. The actual cave is said to be 25 meters, all side channels included, but there is a long route under boulders leading to it, perhaps another 20 meters, and there are crack systems running horizontal and vertical and on many levels.