A team of experts are on a deep-sea mission to study the migratory patterns of a celebrated game fish the striped marlin. Collecting the data needed is a formidable task the fishermen will shoot a tag nearly 25 feet at a tiny target moving at speeds of up to 50 mph! And all of it will have to be pulled off in just seconds as marlin dont hang around for long. Elsewhere, an angler is yanked overboard by a 10-foot blue shark.