During World War II, British Navy submarine cruises underwater and then surfaces and fires its gun

CU gauges on control panel / sailor pulling lever / shot from periscope of submerged submarine cruising underwater / officer looking through periscope / close shot of periscope sticking up above water / shot from vessel of periscope sticking up above water / officer looking through periscope / sailor listening on intercom, sailor next to him writing on chart / CU gauge / officer looking through periscope / torpedoes in racks / sailor listening on intercom, sailor next to him writing on chart / shot from vessel of submarine surfacing / shot from conning tower of sailors firing gun on submarine / shot from vessel of submarine firing its gun / shot from conning tower of sailors firing gun on submarine / Note: exact month/day not known