Eddie “Diver Ed” Monat, a saltwater diver who leads summertime tours of marine life in Frenchman Bay off Bar Harbor, had a close encounter of a toothy kind this past weekend. In a video he posted on Facebook, the eerie outline of a shark can be seen in the plankton-rich murkiness of the bay while he swims below the surface, looking for smaller creatures to bring up to his customers on the Starfish Enterprise.