It was called Operation Sandblast, but it had nothing to do with sand, and the only blasting was the propulsion of a metal tube through water. The USS Triton’s around-the-world underwater voyage in ...

In the 1960s, the Navy built a series of underwater habitats and trained a group of men to live in them. When our story left off, the Navy had successfully operated a Sealab 205 feet below sea level.