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Story summary
- Lifeguard Greg Wilfert was pulled underwater by a great white shark off Scarborough, Maine.
- Wilfert initially believed a boat propeller had snagged his rescue buoy.
- A dozen great white sightings were reported near Pine Point Beach during a two-day period in August.
- Researchers attribute rising great white numbers to federal protections since the 1990s and warming Maine waters.
