Yet we know that sharks live at least as deep as 12,000 feet (3,660 metres) and Sperm Whales (Physeter macrocephalus) are believed to dive to 10,000 feet (3,050 metres) in search of squid.If there's enough food down there for 60-foot (18-metre) whales, there is probably enough to support Megalodon Although very little abyssal life has been sampled, the deep-sea is a very difficult environment demanding numerous significant specializations. Megalodon seems to have been limited to warm, shallow seas near coastlines and there is no evidence it had any specializations that would have enabled it to survive the intense cold of the deep-sea.Unfortunately for them, most of this 'evidence' doesn't hold scientific water: The Coelacanth (Latimeria chalumnae) was thought to be extinct for more than 60 million years until a live specimen was captured in 1938.

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We will probably never know for sure why Megalodon became extinct.

But we can probably be grateful that it did: a 52-foot (16-metre) version of the White Shark with jaws large enough to engulf a rhino would almost certainly make recreational swimming or pleasure boating a LOT less enjoyable.

A number of scientifically untenable - but enormously entertaining - novels have been published, exploring just this possibility.

The giant Mega-Tooth Shark (Carcharocles megalodon) is reconstructed here as a scaled-up White Shark (Carcharodon carcharias) and in 'hot pursuit' of Allodesmus, an early sea lion-like pinniped.

In order to generate these extinction estimates researchers have studied the fossil records of these enormous sharks using state of the art technology and fossil reading techniques to estimate the age of the fossil bones that have been identified such as megalodon teeth and backbone.

The beginning of life on this planet (when it comes to animals) is believed to have started in and around the earths oceans.

Fishing gear gets lost for all kinds of prosaic reasons: fouled in boat props, hung up on rocks, coral, or bottom clutter, human error or carelessness.

In addition, this 'argument' presupposes that Megalodon exists at all. Of course, absence of evidence is not evidence of absence.

Megalodon is the toothy stuff of which legends are made.

There are those who want desperately to believe that somewhere, perhaps in the deep ocean, Megalodon still lives.

But none of the foregoing 'arguments' changes the fact that no fresh Megalodon tooth has ever been collected.