Watch Shark Week's SUMMER OF THE SHARK, Monday, August 1, 2011 at 10PM e/p on Discovery. | http://dsc.discovery.com/videos/shark-week-2011-videos/#mkcpgn=ytdsc1 | Sydney Harbor is everyone's swimming pool. However, disaster strikes this diver in Sydney Harbor, as he tests a new sonar system to help detect terrorist activity.
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