I think the speed of sound in the water has small variations due to pressure & temperature shifts. And error checking & correcting would be difficult, as these variations would make the message unhearable.
To me, it seems as hazardous underwater as on the Internet.
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In the Zeppelin, hydrogen was used for sustentation, because this gas is lighter than air. I think propulsion was from "classical" (it was the 1930's) combustion engines.
History of Zepellins
http://www.access.ch/private-users/argon/history .h tml
Serge Humpich, a french engineer, broke into these cards last year. When he contacted "GIE Cartes Bancaires" (french banks association in charge of these cards) to inform them of the security breach, their only answer was a lawsuit... Doesn't this remind you of something ?
You can find more details here.
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I think the speed of sound in the water has small variations due to pressure & temperature shifts. And error checking & correcting would be difficult, as these variations would make the message unhearable.
To me, it seems as hazardous underwater as on the Internet.
--
In the Zeppelin, hydrogen was used for sustentation, because this gas is lighter than air. I think propulsion was from "classical" (it was the 1930's) combustion engines.y .h tml
History of Zepellins
http://www.access.ch/private-users/argon/histor
Serge Humpich, a french engineer, broke into these cards last year. When he contacted "GIE Cartes Bancaires" (french banks association in charge of these cards) to inform them of the security breach, their only answer was a lawsuit... Doesn't this remind you of something ?
You can find more details here.