[PSUBS-MAILIST] sonic switch

[brian]

Hi All,     I'm looking to try an activate a solenoid valve by using a wireless signal under water.  At perhaps 30 ft or so, was thinking of lowering a transmitter on a wire to the proximity of a scuba bottle. Bottle has a solenoid on it, and then at activate it from the surface via wire going near the device.  Is there any components out there that would be available for not an outrageous amount of money?
Brian
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