Premieres Wednesday, Oct. 11, 2023 at 10 p.m. on KPBS TV / PBS App + Encores Thursday, Oct. 26 at 8 p.m. and Sunday, Oct. 29 at 10 p.m. on KPBS 2. Uncover the sunken remains of a 4th-century basilica in western Turkey. Submerged beneath the waters of Lake Iznik for hundreds of years, the church could reveal crucial insights into the early days of Christianity.