"Fortress" provides guaranteed protection against shrapnel weighing up to 400 grams and traveling at speeds of up to 1,000 meters per second. 

Tests have proven that it can withstand a direct shot from a T-72 tank with a high-explosive projectile, as shown in the videos on our YouTube channel. 

If the Fortress is further buried, it reaches the maximum level of protection among prefabricated shelters. It can be built into existing and newly constructed defense lines. "The Fortress can be installed in trenches. 

Fortress 2.25 is designed to shelter personnel, create command and control centers and stabilization points on the front line. Fortress 3.5 is used to organize warehouses, medical stations and shelter wheeled military vehicles.