The rooms of bottom are at the level of the ditch.
The soldiers were lengthened in the murderesses.
(1)
One reaches superior level by this stair
Main room is in vault, supported with a central pillar.
On four sides constructed murderesses in a assymmetrical way better to protect the defenders of enemy shots.
Every murderess has a slighly different firing angle allowing to cover atmost the
surroundings of the strong.