Near Polotsk, they are looking for a mysterious plane with a missing crew. Evidence from the Great Patriotic War is hidden under layers of soil and sometimes water. They are trying to bring up the wreckage of a supposed terrorist from below. They have not been able to find and retrieve it for many years, and the current underwater search is already the third in almost a century. The plane is shrouded in mystery, and the crew is still listed as having not returned from the mission. Descendants of the Polotsk Orphanage rescued by the once legendary Soviet pilot.