Constructed from two prefabricated parts, assembled on-site in a prepared trench. It features a cylindrical base with an entrance and a reinforced concrete dome-shaped ceiling with a slit-view port.
These shelters were intended for installation, among others, in battalion-level fortified areas on the Polish coast in the 1950s, intended to defend against landings and secure important military installations, such as stationary artillery batteries. It is likely that they were not installed in time, and many ended up in construction dumps or were used as guard shelters in military units.
