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Hidden World Beneath Istanbul's Hagia Sophia Emerges in Restoration

Summary by Daily Sabah
Nearly 9 kilometers of hidden tunnels beneath Istanbul's Hagia Sophia Grand Mosque are being uncovered as part of ongoing restoration and conservation efforts, with around 3,000 to...

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The announcement was made by the Turkish Minister of Culture and Tourism, presenting the progress of the extensive restoration work of the historical monument.

·Marousi, Greece
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Three thousand tons of mud and debris were removed during the cleaning work carried out in the secret tunnels and underground systems located under Hagia Sophia. In the historic building, where the most extensive strengthening work after Mimar Sinan was carried out, it is aimed to connect the cleaned underground areas with the public.

·Istanbul, Türkiye
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Seven underground tunnels dating back some 1,600 years were recently discovered beneath the Hagia Sophia during ongoing restoration work, providing a rare insight into the infrastructure of the monument from the early Byzantine period, while Turkish Culture and Tourism Minister Mehmet Nuri Ersoy confirmed that conservation work at both the Hagia Sophia and the Blue Mosque is progressing under strict scientific supervision. […]

The restoration and research works continue at St. Sofia's Basilica in Constantinople, where approximately 3,000 tons of mud and moloss were removed from the underground structures. Turkish Minister of Culture and Tourism Mehmet Nuri Ersoy presented to the local press new information about the restoration and research work carried out at the former Byzantine cult site,...

The 9-kilometer-long secret tunnels under Hagia Sophia are being cleaned with the aim of being open to the public. More...

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sigmalive.com broke the news on Monday, November 2, 2026.
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