Listening intently to a steady stream of static, suddenly you hear a series of low tones followed by a robotic woman’s voice:

“Yankee… Hotel… Foxtrot… Yankee… Hotel… Foxtrot… Yankee… Hotel… Foxtrot…”

The static continues as a sheet of white noise in the background. The woman continues:

“0,0,9,6…8,1,0,5…2,2,5,1…2,1,1,0…0,0,9,6…8,1,0,5…2,2,5,1,…2,1,1,0…”

These strange series of words and numbers are [...]