Bleeched coral reefs, Florida.

Video. Watch: high temperature killing Florida's coral reefs

An urgent rescue operation is underway to save Florida coral species from extinction as a mass bleaching event and die-off from unprecedented water temperatures spreads across reefs in the Florida Keys.

An urgent rescue operation is underway to save Florida coral species from extinction as a mass bleaching event and die-off from unprecedented water temperatures spreads across reefs in the Florida Keys.

Multiple reefs around the Florida Keys are now completely bleached or dead in a grim escalation that took place in as little as two weeks, coral experts said.

Scientists now say they expect “complete mortality” of the bleached reefs in just a week, and worry reefs at greater depths could face the same fate if the unprecedented ocean warmth continues to escalate.

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