Question

what is the mystry of dragon triangle

Answer 1

The Devil's Sea (Japanese: 魔の海 Hepburn: Ma no Umi), also known as the Dragon's Triangle and the Pacific Bermuda Triangle, is a region of the Pacific, south of Tokyo. The Devil's sea is sometimes considered a paranormal location, though the veracity of these claims has been questioned.

Answer 2

it still remained as a history
BERMUDA TRIANGLE