WELLFLEET, Mass. — More than 40 people — including marine mammal experts, interns and volunteers — spent several hours battling an incoming tide to help rescue seven dolphins that got stranded in the shallow waters of a Cape Cod river this week. The International Fund for Animal Welfare first got word that the Atlantic white-sided dolphins got stranded in a shallow gut of the Herring River in Wellfleet around 7 a.m.