this right to you. One big fishy tale. Two men off the coast of florida snagging something so big they originally thought it was a submarine but guess what, it was a great white shark and it was all... See More
this right to you. One big fishy tale. Two men off the coast of florida snagging something so big they originally thought it was a submarine but guess what, it was a great white shark and it was all caught on tape. Abc's gio benitez has their story. Ooh, there he is right there. Reporter: For two fishermen it is a catch of a lifetime. Oh, my god, it's huge. Reporter: What they say appear to be giant shark weighing as much as 3,000 pounds on the end of their line florida. Near tampa. The massive predator struggles to get loose and fab is holding on tightly to his fishing rod. I wasn't going to give up. My stubbornness and determination helped me. Reporter: The battle, he says, went on for three hours. Captain joe mazoni was by his sides. Can't believe jaws was swimming around. Just incredible. My whole thing was I wanted to get that thing in and wanted to make sure we had a picture of it. Reporter: And, boy, did they. Capturing this video as the drama unfolded on friday. Looked like a submarine with a tail. That is huge. That's huge, man. Reporter: In the end it was too big and illegal to kill. So the pair of fishermen turned sea warriors and let the shark go. Oh, my god. Oh, my god. Reporter: But with so much digital trickery online, what did the two men say to people who think the video is fake? I really don't care what they say because I was there. It's live like I -- I really don't care what people think right now. I know it's true. It happened. Reporter: Whether or not this is the king of the sea, these guys say it was a moment to remember. Gio benitez, abc news, miami. They're going to need a bigger boat.
This transcript has been automatically generated and may not be 100% accurate.