Ancient tunnels beneath famous Hagia Sophia explored after 3,000 tons of debris cleared

Revealing 1,600-year-old Roman passages beneath Istanbul, archaeologists removed roughly 3,000 tons of debris from Hagia Sophia's underground tunnels recently.

Revealing 1,600-year-old Roman passages beneath Istanbul, archaeologists removed roughly 3,000 tons of debris from Hagia Sophia's underground tunnels recently.