Between 2007 and 2009, night security guard Yalcin Yalman filmed roughly 25 video sequences of unidentified objects over the Sea of Marmara near Kumburgaz, Turkey. Turkey's national scientific authority TÜBİTAK and the national observatory TUG reviewed original footage and stated it showed 'a physical structure' inconsistent with CGI, balloons, or known aircraft.

Using a consumer camcorder with 200x optical zoom, Yalman captured what appear to be structured metallic objects over several consecutive seasons. Sirius UFO Research Center director Haktan Akdogan organized an international panel review in 2009. Skeptics have proposed the objects are a ship's cabin or cruise vessel viewed through extreme telephoto compression, but no definitive conventional identification has been confirmed.