Scientists say they've discovered a "mega coral" three times bigger than the previous record holder - so huge they initially thought it was a shipwreck.

At 111 feet wide, 104 feet long, 18 feet high, and 600 feet around this stunning organism in the southwest Pacific Ocean is the world’s largest known coral that was discovered by accident. It is a conglomerate of individual creatures called coral polyps that have grown over 300 years.