Actually, there is rather a lot of debate about this subject.
1) Professor Bashford Dean in 1909 estimated a length of up to 98' (30m)
2) Hawaiian Icthyologist John E. Randall in 1973 estimated from two tooth samples a length of 43' (13m)
3) Michael D. Gottfried, Leonard J. V. Compagno and S. Curtis Bowman in 1996 estiamted a length from samples they had of 52' (15.9m)
4) Dr. Clifford Jeremiah in 2002 estimated from the largest tooth he had a length of 51' (15.5m)
5) Dr. Kenshu Shimada of DePaul University in 2002, once again from the largest tooth he had (do you notice a pattern here?), estimated 55' (16.8m)
Currently the consensus on the subject is a length of more than 52' (16m). Although some consider a maximum length of 67' (20.3m) to be about top whack, but some others have also suggested, in the 1990's, that it could have reached, in extraoridanry circumstances, some 82' (25m). As you can see, the debate still continues, and will very likely continue till the end of time, as more teeth are found, as these are, of course, the only part of a shark that is likely to fossilise as there skeletal structure is more cartilage than bone. I suppose the only definitive proof we will ever have is if one is in fact found alive. This is possible as we know very little about our oceans, although probably unlikely.
As an aside, the largest tooth that is currently known is around 193mm in length, which, using the most considered method, would yeild a megalodon of some 57.6' (17.46m). So take from that what you will.
My real problem with this film, is the small fish they pull out of the tube. They call it a Dunkleosteos, which didn't strictly speaking have teeth, but extensions from it's bony skull. the fish in the film has teeth like needles, which would lead one to another species entirely, possibly more recent.
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