city: Joensuu, Finland,
Points of entering (see map):
OTRAVAARA is a mine located in the North Karelia region, province of Eastern Finland, Joensuu city, with a depth of 82 m. Only persons with technical level of training can dive in this place. The diving site was formed after flooding the mine in 1919.
Related and native dive bases:
More information about this place You can find here: