A huge swath of the Atlantic Ocean is cooling at a record rate — and scientists have no idea why

From uncharted trenches to the Bermuda Triangle, the world's oceans are full of unsolved mysteries. But one of the strangest questions is why a vast area of the Atlantic Ocean suddenly began to cool at a record rate.

Through March, the mid-Atlantic experienced its warmest weather since 1982, reaching highs of 30° (86°F).

But this was followed by a dramatic temperature swing where the surface water temperature dropped below 25°C (72°F) – and scientists still don't know what caused it.

Michael McPhaden of the National Oceanic and Atmospheric Administration (NOAA) told the Live Science : 'We are still scratching our heads on what is actually going on.' (William Hunter, more at dailymail.co.uk)