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(CNN) -- A person was rescued Monday after falling into Crater Lake, a dormant volcano.
According to the U.S. Coast Guard the man fell 800 feet down into the caldera near Rims Village.
Rescue teams descended about 600 feet into the crater and could hear the man yelling further down into the crater.
The man, who has not been identified, was hoisted and transferred to a hospital in Bend, Oregon, for treatment.
His condition and the extent of his injuries are not immediately known.
Earlier in May, park officials warned visitors that rocks and snow near the edge of the caldera were unstable and could give way without warning.
The crater's depth of 1,943 feet making it the deepest lake in the United States and the ninth deepest in the world, according to the National Park Service.