Uncover the sunken remains of a 4th-century basilica in Turkey. Submerged beneath the waters of Lake Iznik for hundreds of years, the church could reveal crucial insights into the early days of Christianity. Join a team of international researchers as they travel back through time—and grapple with Turkey’s many earthquakes, which could sink the structure deeper at any moment. Sunken Basilica Reveals Glimpse of Early Christianity | Full Episode Secrets of the Dead | 55:35 PBS | 1.69M subscribers | 23,809 views | March 18, 2026