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Step 5: XCP cast About 30 seconds after the XCP is tossed into the salty water, a torpedo shaped object is expelled. It carries with it a thin copper wire, one end of which remains attached to the black casing floating at the surface. The data are transmitted as a radio signal.

This material is based upon work supported by the National Science Foundation under Grant No. 0230427.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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