Just a few weeks ago, Florida native Dave Tuthill ran his boat 67 miles offshore, found and nice color break where green water met clean blue, and immediately started hooking mahi mahi. The next thing Tuthill knew, mahi were spraying and one of his lines got knocked down by something significantly larger. Fast forward through the 3 1/2-hour fight, and Tuthill ended up back at the dock with a 500-plus-pound blue marlin. So what's the big deal? Sounds like a typical Florida offshore experience, right? Yes, except this all happened off the coast of Hong Kong, and there are some interesting twists.