00:00A spy bug listened for years.
00:02No batteries, no wires.
00:05Impossible.
00:06The CIA's thing had zero power.
00:10External radio waves secretly powered it.
00:12Room sounds vibrated a tiny metal plate.
00:16This changed the radio signal's echo.
00:18It hid for seven years in the U.S. ambassador's office.
00:22Think what it heard.
00:24This incredible passive bug changed espionage forever.
00:28Explore more secrets at the link in bio.
