Educational toys are a clever way to teach your kids while they think they're just having fun. Like this old-school airplane toy which was secretly training America's kids on how to be successful bombardiers for a possible nuclear war.
Depths might not be the right expression, actually, as all of these photographs were taken from space, decades and decades ago. Russian rockets, aircraft carriers, secret military compounds—one legendary spy satellite saw it all from orbit.
The HEXAGON satellite spied on America's Cold War foes for over a decade, taking extremely detailed (film!) photographs from space. It was 60 feet long—bigger than a bus. And the public never, ever saw it. We did.