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Coincidence? perhaps. here's what hurley the hammerhead's track looked like the days before it disappeared. >> the tag could have failed or it could have headed off somewhere else in deep water and just not come up in the last few months, but that's very unlike the shark's character. >> who is biopsy? >> on this day at sea, the le n lemons keep coming. three black tips, too. the blood and tissue from these guys will be tested for concentrations of hydrowcarbons from oil. they worry sharks could be easily contaminated, even if they never swim near the oil. >> they don't want people to catch any...

The oil, hammerschlaeg will know it. one shark that was tagged transmitted nearly every day for three months. but two days after the deep horizon explosion, the transmissions subtly stopped. coincidence? perhaps. here's what hurley, the hammerhead's track, looked like days before it disappeared. >> the tag could have failed or it could have headed off into deep water and not come up in the last few months. but that's very unlike the shark's character. what's the next biopsy? >> reporter: on this day at sea, the lemons keep coming. three black tips, too. the blood and tissue from these guys wil...

Tagged with a satellite transmitter. if the shark goes near or into the oil, hammerschlag will know it. one shark transmitted every day for nearly three months. but two days after the deephorizon explosion, the transmissions suddenly stopped. coincidence? perhaps. here's what hurley, the hammerhead's track looked like the days before it disappeared. >> the tag could have failed or it could have headed off somewhere into deepwater and just not come up in the last few months. but that's very unlike the shark's character. >> what's next? biopsy. who is biopsy? >> reporter: on this day at sea, the...