The famous city of Nicaea (where the 1st council of christian took place) was established on the shore of Lake Iznik, 5 km of the North Anatolian Fault. In 2014, a basilica was discovered in Lake Iznik; it was destroyed and submerged following an unknown catastrophic event. The scientific investigations of 15 international researchers from different disciplines (archaeology, tectonics, sedimentology, geophysics) will reveal invaluable data on the seismic behaviour of the NAF on the last 7000 years and see how it is related to the history of this basilica.