UCL Division of Biosciences


Global cooling helped life flourish in ocean’s twilight zone

16 March 2021

Life populating the shadowy ocean flourished thanks to the cooling of the Earth’s climate over millions of years.


The research team tracked the development of the largest and least understood habitat on Earth, home to a wide range of mysterious creatures, including plankton, jellies, krill, squid and fish.

The ocean’s twilight zone extends from 200 to 1,000 metres below the ocean’s surface. Within it is a hidden treasure of biomass and biodiversity that is key to the health of our oceans.