“I never imagined doing this type of photography,” Mears says. The two met in an underwater photography club in Florida, and both tried their first night dive after another member of the club recommended it to them more than seven years ago. Since then researchers, hobby divers and photographers have gone out to scuba dive at night and observe these nocturnal creatures.įor Linda Ianniello and Susan Mears, this so-called blackwater diving has evolved from a pastime into a passion. Navy, whose new sonar technology began pinging congregations of objects in the water column. The nighttime migration was first discovered in the 1940s by the U.S. The animals make this journey to feed on the organic material closer to the water’s surface and do so at night to avoid being eaten by the larger predators swimming there. This daily vertical migration is the largest on Earth-an estimated 11 billion tons of animal biomass travels miles upward each night and then, before the sun rises, returns back to the dimly lit “twilight zone” below. Every night at sundown, a great mass of mostly small sea creatures rises up from the depths into the topmost layers of the planet’s oceans.
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