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"edge ofs discovery." >> reporter: this life guardn might be the best on the beach. her name, emily. it doesn't replace the life guard, but may enable the life guards to get to an individual they may not have been able to get to in the past. emily speeds through high waves in seconds, directed from shore by a remote ntrol. when she reaches swimmers in distress, they can hold on to her until help arrives. >> we have worked on having a radio to send emily out to say, stand away from this, you're in danger of going into tide. >> reporter: that's not all this cado. her designers say emily could be equipped with sonar and cameras or be used for military surveillance. emily is still being tested, so it could be a wle before you