What a find by this crew of Russian diggers - a Soviet era anti-tank rifle in decent shape considering it was submerged for over 70 years. I edited this clip from a longer 30 minute video, at 2:15 note the shrapnel damage on top of the receiver and bolt on this rifle, and you can learn more about the PTRD (Protivo Tankovoye Ruzhyo Degtyaryova) here.