Inside the bulwark, artillery is placed at 17 cannon holes. On the ground floor bunker, the floor is inclined towards the outside to allow water to go out if it enters the tower. Also, a small gift shop is located inside the bulwark of the tower, where cannons are placed. In the past, there were two batteries in place, lower and the upper. At the very bottom, a dungeon was used to store for the magazine and the prison cells. The main façade of the fortress faces the river but this window offers a view of the area.