Title: ĖPRON
Subjects: Salvage, Sources, Deep diving, Ekspedit︠s︡ii︠a︡ podvodnykh rabot osobogo naznachenii︠a︡ pri VChK OGPU, History, Ėkspedit͡sii͡a podvodnykh rabot osobogo naznachenii͡a
Places: Soviet Union