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and in 53 cases, rescuing and releasing the dolphins. along a 35-mile stretch of the cape's interior coastline, the hook shape of the peninsula traps the dolphins in cape cod bay. >> once in the bay, they can't find their way out. we think that's a big part of it. >> reporter: here the rise and fall of the tide is dramatic, a difference of 13 feet where we walked. this winter, when the tide goes out, trouble comes in. a half mile offshore, this sand bar is a dolphin graveyard. so far we found six just in this area alone. researchers measure, take samples and tag each and every dolphin, hoping science can decode the mystery. is there anything on this dolphin that would explain why it's stranded? there are lots of theories. the warm winter is one. when was the last time you saw ice in the harbor? >> probably three years ago.