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Recent studies indicate that Mont-Saint-Michel has many hidden secrets waiting to be discovered thanks to modern technology, such as 3D modeling, which allows experts to see this architectural wonder in new dimensions. One significant discovery is the ancient church, Notre-Dame-Sous-Terre, located 20 meters beneath the main abbey. Once thought to be the original sanctuary erected around the 8th century, scientists have now dated it to the 10th century, revealing it to be a successor to an earlier place of worship. The application of archaeomagnetism enables researchers to pinpoint the exact time when materials were used, creating a clearer timeline of its construction.