Building B I has a cupola for a periscope and a machine gun. It's also the main entrance to the underground complex today.
Building B.O. is for the ventilation and is protected by a cupola for observation and Mg.
Block B 11 has the rising cupola for 2 times a 75 mm gun. The adjacent cupolas have a Mg and a periscope.
This special construction has a cupola for Mg and observation and a cellar in front for three mortars 81 mm. It's block B.M.
Block B III was designed to fitt a cupola with 2 times a 120 mm gun. This action was never completed, but the three adjacent cupolas are in place.
Block B IV has also 2 times a 75 mm and two positions for Mg and periscope.
The details of one of the guns.
The Mg positions look like a German bunker type 648.