Originally, the church had two towers with rooms on two levels, in which food supplies were stored.
In the southern tower, which has now disappeared, the first floor was accessed by a ladder (as often in dungeons). From there, a steep and narrow staircase, built in the thickness of the wall of the west facade, led discreetly to the other tower, the north tower, which now serves as a bell tower. This secret passage (which still exists) allowed the defenders to move secretly and safely from one tower to the other. The bell tower is the most authentic.
At the top of the bell tower, traces of bolt holes can be seen, which makes it possible to imagine a series of walkways that contributed to the defence of the building.