Shadowy coral kingdoms

Tropical coral reefs extend to a surprising 150 meters below the surface. The brightly lit reefs in the top 30 meters, dominated by scleractinian or stony corals, make up about 20% of coral reef habitat and can be reached by divers using conventional scuba gear. Divers using rebreathers are just beginning to explore the remaining 80% of living reef habitat, called the mesophotic coral ecosystem.

by Science

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