Finland Builds Underground Fortifications Based on Lessons From Ukraine War

The Finnish Defense Forces have constructed an underground fortification system drawing on lessons from the war in Ukraine, describing it as “the most important basis for development.”

The video showing the fortifications was published on the official YouTube channel of the Finnish Defense Forces.

“We naturally responded to the doctrines of the war in Ukraine. We already have a developed shelter system initiated through industrial cooperation in 2016, and the need for protection became even more urgent with the start of this conflict,” the Finnish military said.

The new construction integrates combat and residential spaces into a larger complex, requiring zoning to contain potential explosions within the facility.

Faced with emerging threats, including drones, the military reinforced the shelters with protected passages and strengthened combat areas.

Entrances were fortified, and passages fitted with nets designed to keep out kamikaze drones.

A dedicated launch area was also created to allow drones to be deployed directly from the shelter without exposing operators to risk. All passageways were designed to accommodate stretchers, and the facility is equipped with extensive fire suppression systems.

Military officials noted that training is critical: “It is necessary to practice combat operations in confined spaces, including transitions from tent accommodation to shelter, use of compartments, heaters, chemical toilets, and fighting inside the shelter itself.”

In July, Finland and Lithuania announced plans to begin producing anti-personnel mines next year for domestic use and potential supply to Ukraine, citing the military threat from Russia.

Both countries recently withdrew from the Ottawa Convention, which bans the production and use of such mines. Officials said production can begin after completing a six-month withdrawal process.

Finnish defense companies Nammo Lapua, Insta, and Raikka have already expressed interest in producing the mines to the parliamentary defense committee.