In the 1960s, the U.S. Navy was exploring the other "final frontier" -- the sea. A series of underwater habitats called "Sealabs" were constructed for scientific exploration on the ocean floor.

Photoshop CS6 Extended tutorial showing how to add chiseled text to a headstone or gravestone and then transform it to look ...

While NASA was trying to put a man on the moon, the Navy was quietly conducting a series of tests to see if humans could live ...