Well, let me tell you that basically there has been a legend or folklore amongst the sailors who have sailed across the Indian Ocean that sometimes at night, and for miles around, they could see the sea glowing in a bright white light and hence the term– glowing milky seas.
To date it was mostly believed that it is perhaps a mysterious phenomenon which has not been proved scientifically and perhaps does not even exist, something similar to, say, the Loch Ness Monster or the Bermuda Triangle mystery.
But it was only about a decade ago- eleven years to be precise- that two scientists finally discovered what could be a possible scientific explanation of this phenomenon, as well as a proof of its authenticity.
This phenomenon has been existence for nearly past 400 years and there have been sightings of this nature where sailors have experienced sailing in milky seas at night. One such vessel was S.S. Lima which sailed somewhere around the coast of Somalia more than 11 years ago.
Steve Miller and Steve Haddock, the two scientists, actually traced satellite images of the Indian Ocean of the time when the ship had actually traversed the region, and actually found it on the satellite map itself. The hypothesis put forward by them for the explanation of this phenomenon is explained below. You can also see the satellite imagery of this phenomenon in the adjacent image. (Click image to enlarge.)