submarine, Type VII U-boat, German Kriegsmarine, World War II, steel hull, conning tower, periscope, torpedo tubes, deck gun, anti-aircraft gun, naval camouflage, ocean waves, deep sea, underwater scene, patrol mission, historical military vessel, side profile view, dramatic lighting, cinematic composition, high detail, rust texture, barnacles, realistic, ambient light, murky water, sunken shipwreck, marine life interaction, coral growth, historical accuracy.