Bunker Irma, No. 302, is located along the Harparskog Line, near the Front Museum. When you go through the heavy steel door, you step straight into history. You enter the bunker through a heavy steel door and step right into history. The walls and ceiling, up to two and a half meters thick, preserve a world that once housed up to 20 soldiers. Just a few meters away, the anti-tank obstacles rises, built to stop an attack from Hanko, which was then under Soviet control.
The bunker has been restored to its original condition and is filled with wartime details. Inside you’ll find air circulation equipment, a wood stove, beds for soldiers, a machine gun, and a 45 mm anti-tank gun - all in their original form. The smell of metal and moisture, the cold concrete, and the narrow spaces make it easy to imagine what life was like here during long sleepless nights waiting for the next order.
The guide brings the stories to life, and when the sound effects begin at the end, with smoke and loud noises, it feels as if you were participating in the events. The emotions linger long after you step out into the daylight again.

Available:
Year-round
Group size:
20 persons/guide, max. 40 people
Length:
~ 1-1.5 hrs
Start:
Mannerheimintie 56, 10680 Raasepori
Accessibility:
The bunker is narrow with high thresholds between rooms. Smoke and loud sounds at the end.
Price:
80 €/guide + entrance fee. A 25€ opening fee applies outside normal opening hours.
Other:
The tour can be combined with a visit to the Front Museum and other guided tours.
Transportation to or from the front museum is not included in the price.
Would you like to book a guided tour in bunker Irma for your group?
Please contact the museum coordinator:
Phone: +358 44 700 1941
E-mail: info@frontmuseum.fi
Open guided tours in bunker Irma
Information about our open guided tours is published on our website under the “News and Updates” section, as well as on our social media channels.
What is the Harparskog Line?
Finland perceived the Soviet naval base on the Hanko Peninsula as a threat. The new border lay only about 100 km from the capital. Because of the potential risk of attack, a decision was made to build a heavily fortified defensive line in the Harparskog–Skogby area.
During the Interim Peace, the forests and rocky terrain were bustling with activity as this massive construction project got underway.
But no one knew how much time there was to build…
