Unknown underground spaces of Hagia Sophia to be revealed in restoration project

Turkish authorities are conducting an extensive restoration project at the Hagia Sophia in Istanbul, which has led to the discovery of previously unknown underground spaces, tunnels, and crypts. The Minister of Culture and Tourism, Mehmet Nuri Ersoy, announced that these areas may eventually be opened to the public following careful scientific assessment and preservation work.

Described as the most comprehensive restoration effort in the history of the Turkish Republic, the project includes structural reinforcement of the central dome and the eastern semi-dome. Since February 2025, crews have removed approximately 3,000 tons of mud and debris from the site. Minister Ersoy noted that the current interventions are among the most significant since the era of the architect Mimar Sinan, emphasizing that all work is being conducted under strict scientific supervision.

The government plans to first showcase the newly uncovered underground sections to journalists before establishing the safety conditions required for public access. The restoration aims to preserve the 1,500-year-old monument while allowing visitors to explore historical levels that have remained hidden for centuries.