I wonder what a large underground parking garage would look like after 100 or 500 years of neglect... probably very much like a cave.
Here are some cave forms:
"xxx 1. Skevabackgrotta, Kirkkonummi, 2032 08 Kirkkonummi, x=6666,xx, y=2526,yy. 2.4. Längstrandin maalla. Suuakko on romahtanut. EI TARK."This is difficult to interpret, but the location points to somewhere north of the Peuramaa ski area. This is close to the Högberget cave. I've always had a suspicion that the Högberget cave might be a beach cave rather than ice age cave, now lifted 30 meters higher due to rising ground in the last 10 000 years. Could the Skevabackgrotta be a similar one?