In the ‘30s, operators of the new sonar felt they found the ocean’s bottom. Only problem was that it kept changing. They’ve now discovered that it’s a layer of ocean life that moves up and down on a regular basis.
Between the ocean’s bright blue surface and its blackest depths — 660 to 3,300 feet below — is a mysterious, dark span of water. Welcome to the twilight zone.
Recent evidence suggests there are more animals here by weight than in all of the world’s fisheries combined. But who lives here, and in what quantities?
And it all looks quite fierce.
But not really that big.
Much more of this amazing story @ Visitors From the Ocean’s Twilight Zone