Ground at that level is always at 50 degrees until you heat it up. Geothermal cooling requires HUGE transfer area due to the low thermal conductivity of the ground. I don't think you will upgrade to a working system for the $30 the original system cost (well, $30 plus a heck of a lot of ice:)
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A barcode big enough to contain all the biometric info the chip can contain would be huge.
Ground at that level is always at 50 degrees until you heat it up. Geothermal cooling requires HUGE transfer area due to the low thermal conductivity of the ground. I don't think you will upgrade to a working system for the $30 the original system cost (well, $30 plus a heck of a lot of ice :)