I saw a 700-800 pound blue fin dead on the docks at Province Town, Massachusetts.
I do not want to even think about what an endurance test that would be if you should hook one. I would pass and not give it a go.
Had my one levithan on (Big Wisconsin Chippewa Flowage Musky)
probably 45 ponds plus. It was liked being hooked to Red October, dragged me all over flowage, until it decided to end the game.