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Transmitter. if the shark goes near or into the oil, hammerthis lag will know it. one shark his team tagged transmitted nearly every day for three months. but two days after the deep horizon explosion, the transmissions suddenly stopped. coincidence? perhaps. here's what hurley, the hammerhead's track looked like. >> the tag could have failed or it could have headed into deeper water and not come up in the last few months, bu that's very unlike the shark's character. >> next up, whose biopsy? >> reporter: on this day at sea, the lemons keep coming. three blacktips, too. the blood and tissue fr...

Before it disappeared. >> the tag could have failed or it could have headed off somewhere else into deep water and just not come up in the last few months. but that's very unlike the shark's character. >> reporter: on this day at sea, the lemons keep coming. three blacktips, too. the blood and tissue from these guys will be tested for concentrations of hydrocarbons from oil. scientists worry sharks could easily be contaminated, even if they never swim through the oil. >> there's fishing areas been closed in the gulf of mexico because they don't want people to catch any dead fish. but i don't k...