It was constructed on a series of terraces; there were four main levels and three large bulwarks to house the artillery. Supplies would be delivered by sea and then stored in the large warehouse, which was cut directly into the rock, or transported up to the top level which housed the citadel. Construction of the citadel took 62 years, starting in 1638 and finally being completed in 1700, though work on the fortification was spasmodic.
The structure was built across multiple tiers; there were four primary levels and three significant bulwarks for mounting artillery. Supplies would be delivered by sea and stored or transported to a citadel located at the highest level. The construction of the citadel took 62 years, starting in 1638 and finishing in 1700, with work on the fortification being intermittent.