Wireless technology won't work because the satellite signal can't penetrate 20-30 feet of earth.
2006-07-01 16:30:48 · 4 answers · asked by EyesWideShut 2 in Science & Mathematics ➔ Other - Science
UHF, Ultra High Frequency
2006-07-08 14:35:46 · answer #1 · answered by ? 6 · 0⤊ 0⤋
There was a song about it, actually--"Knock 3 times on the ceiling if you want me...twice on the pipes if the answer is no." They're French, so love is the only thing they deem worth communicating about, most of the time. If they have any other pressing concerns, they deliver their message by carrier rat.
2006-07-01 23:57:19 · answer #2 · answered by thunderpigeon 4 · 0⤊ 0⤋
over wires or by sending radio waves through the tunnels.
Plus you can always bang on pipes in Morse code.
2006-07-01 23:34:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋
What's to talk about when you're up to your ears in sewage?
2006-07-01 23:34:44 · answer #4 · answered by Anonymous · 0⤊ 0⤋