sonar
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Secret Cold War Sonar Tech Is Being Used To Map Underwater America
Space may be the final frontier of exploration, but there’s plenty of Earth left unmapped too — from the giant canyon recently discovered beneath Greenland to American waters that have been left largely unexplored. But that’s quickly changing, thanks in part to Bob Ballard’s latest project.
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Before Radar, Militaries Used Gigantic Headphones For Land-Based Sonar
Radar is wonderful, sure, but militaries didn’t always have the benefit of radar to pinpoint enemy locations. Before that, there was sonar. Underwater is one thing, though. On land, you needed big victrola-like contraptions that looked uncomfortable as all hell.