There are a lot of interesting data sources for searching for new caves. There are databases at the national geology research institute [1, 2, 3]. There are reports and books of boulder fields [4,5]. There are websites [6, 7, 8, 9, 10]. Old newspaper keyword searches . And regular maps . But in addition, there are also names of places. Ralf had found the names Luolaniittu (cave field, on a small hill) and Luolassuo (cave swamp, an actual swamp) in Paimio. I have to say we felt pretty silly standing in the swamp with all our caving gear.
That being said, we explored the area. You have to comb through places to see what if anything is there. So that was our contribution :-) Plus it was good exercise, and the blueberries were tasty :-)