9 Unsolved Ocean Mysteries

Underwater whirlpools

Also called underwater tornadoes, in certain conditions they can break away and swirl around like flying saucers across the ocean.

Milky sea phenomenon

Milky seas are a condition on theoceanwhere large areas ofseawater(up to 6,000 sq mi or 16,000 km2) are filled withbioluminescentbacteriaordinoflagellates, causing the ocean to uniformly glow an eerie blue at night. The condition has been present inmariner’s tales for centuries – notably appearing in chapter 23 ofJules Verne’sTwenty Thousand Leagues Under the Sea– but until recently it has not been rigorously documented.