The embrasure of block 5. The two large embrasures are for a 75 mm mortar model 1931. These weapons had a range of 5,8 km. They were supported by two 81 mm mortars on the lower level. They fired at an angle of 45°. On the right you can see an embrasure for a light machine-gun. A similar weapon was placed in the embrasure on the left that had to provide cover for the other embrasures.