I had that same thing happen a few weeks ago out there. I was using 100 lb power pro on a 6/0 rod n reel and I bout got ripped out of the boat and nevver could get any ground on the fish. Beat the crap out of me and thank god my buddy was there to grab my belt cause i would have been going over the side if it wasn't for him. whatever it was broke me off on the wreck after after like 20 minutes of wrestling what ever it was. wish I could have gotten a gander at the beast.