Experimental ditching test conducted by a pilot most likely from the NACA Langley Aeronautical Laboratory.* The B-24 was ditched into the James River on September 20, 1944. A pilot flew the plane into the water and the B-24 definitely experienced damage. Silent.
*The YouTube comments indicate the pilot worked for the NASA Langley Research Center, but as desertdog5051 pointed out, NASA wasn't formed until 1958.