Two Massachusetts fishermen spent three hours fighting to reel in what they at first thought was a shark, but turned out to be likely the largest Atlantic blue marlins ever caught off the East Coast.

Damon Stacco said the day started off with no luck, then after he and client Walter Chapman loaded up the boat with yellowfin tuna, he saw a fin while fishing roughly 100 miles off Cape Cod.

A “huge dorsal,” he wrote on his Instagram page. “Am I really seeing this? Four feet high but pointed. A blue hue flashed beneath it. Pecs? Holy s— it’s a marlin! The fin dissappeared [sic] when I screamed. I dropped back the rod beside me and the tip bounced…

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