London, England (CNN) — The planet's seas and oceans are richer and more diverse than scientists suspected, the biggest survey of marine life has revealed — but many mysteries remain.
The Census of Marine Life, which announced its full findings Monday, has taken 10 years to complete, employing 2,700 scientists from 80 nations. The $650 million study surveyed from the coldest waters to the warmest lagoons, from the smallest microbes to the largest cetaceans.
It even looked at life 10,000 meters (6.2 miles) down in the Marianas Trench southeast of Japan.
Scientists tagged and tracked marine creatures in order to gain insight into their migratory habits and populations as well as how they breed and what they eat.
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