It has been quite a while since we met Osman Okkan, personally, maybe the last meeting was even the one at the multi-day seminar in Adrasan, where we met at a seminar about the documentary cinematic presentation of various Turkish authors and their works.

With his team which is composed of divers and speleologists; director Göksel Gülensoy, who is passionate about Hagia Sofia that impresses people with its dimensions and architecture, brought the secrets which are hidden in the depths of Hagia Sofia to light.