Where in the oceans are biological communities thriving without sunlight?

in muds of deep-ocean trenches
in shallow water, coral reefs around seafloor, hot spring vents around fissure vents for flood basalts

around seafloor, hot spring vents

Explanation:

The oceans are home to a rich diversity of life forms on the earth and they have long survived and sustained themselves in the deep oceanic hydrothermal vents. The species are found along the seafloor and they have distinct characteristic features and are known to the origin of the life forms on earth till date more than billions of species have been discovered.

C14 hope it your welcome