Project lifts the veil on life in the ocean's twilight zone

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Science  24 Aug 2018:
Vol. 361, Issue 6404, pp. 738
DOI: 10.1126/science.361.6404.738

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Between 200 and 1000 meters below the ocean surface lies the twilight zone, a mysterious, dark, poorly studied part of the ocean that teems with sea life. This week, a new program to study this region, also called the midwater, kicked off with a 10-day research expedition to the North Atlantic Ocean. The centerpiece of the 6-year, $35 million Ocean Twilight Zone project is a 5-meter sled called Deep-See, which holds advanced acoustic sensors and cameras. The inaugural dives of the device revealed a surprising density of organisms from the surface down to 1400 meters below; in the past, scientists have seen organisms clustered at a single band of depth.