AVALON (CBSLA.com) — A marine science instructor found the carcass of a rare 18-foot fish while snorkeling off the coast of Catalina Island over the weekend.

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Jasmine Santana of the Catalina Island Marine Institute discovered an oarfish while snorkeling in Toyon Bay on Sunday.

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It took 15 people to bring the giant fish, which appears to have died from natural causes, up to the beach.

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Oarfish dive more than 3,000 feet deep, so sightings are considered to be rare.