 Between 2003 and 2004, the cost for just the conservation work was estimated to be €10,600,000, while the total rehabilitation cost, including conservation, restoration, and research, reached as high as €22,000,000.In 2005, the combined cost for basic conservation and research dropped to €4,000,000.Despite conservation efforts, the fortress is still at risk of damage, for reasons, both natural and man-made.