In the past year alone, the international team has identified 1,000 new plants and animals and shed light on the behaviour of hundreds of species.
The Census of Marine Life, a massive project involving more than 2,000 scientists from 82 nations, is now in its eighth year.
So far it has recorded 120,000 species but believes there could be as many as 250,000.
The finds include the deepest-living creature-ever discovered.
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