The two twin-mounted Maxim machine guns have been installed, and after the upgrade, the gate looks thicker and sturdier.
Especially since the gate's structure was changed from sliding to lifting, the entire gate is now neatly embedded in the wall. To open it without lowering the gate, one would have to blow up the entire wall.
The original gate, made of ordinary steel-plated reinforced concrete, was upgraded to solid heat-treated homogeneous nickel-chromium alloy steel plates with a thickness of 30 cm.
During World War II, Japan used this type of steel as the main armor for the Yamato-class battleships and stacked its thickness to an insane 650 mm.
At that time, the Yamato-class main gun armor was 650 mm thick, and no cannon could penetrate it in the immune zone.
