WWII USSR Submarine Sht-211
Resting on the seabed off the Bulgarian coast, this Shchuka-class Soviet submarine sank after striking a mine during wartime patrols. The hull lies severed into sections, with the conning tower, bow torpedo tubes, and deck machinery recognizable beneath marine growth and silt. Exposure to open Black Sea currents and deep water demands trimix qualification alongside thorough decompression planning.
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