Scientists have discovered the largest single coral ever recorded – so big that they had originally thought it was a long-forgotten shipwreck.

Scientists say they have discovered the world's largest coral — measuring longer than a blue whale — on an expedition in Solomon Islands.

Discovered in the Three Sisters island group by members of the National Geographic Pristine Seas team during their scientific expedition to the Solomon Islands, the mega coral — mostly brown but with splashes of bright yellows,