What one sees without artificial light a few hundred meters below the surface.
Gulf Stream.
Image ID: expl0504, Voyage To Inner Space - Exploring the Seas With NOAA Collect Location: Transect at 31 30 N Latitude east of Georgia Coast Photo Date: 2004 August 30 Credit: Estuary to Abyss 2004 Expedition. NOAA Office of Ocean Exploration.