Mariana Trench
Since the Mariana Trench is the deepest oceanic trench on the planet, it is practically difficult for anybody, even researchers, to get access to it. This is the primary reason why entry to the Mariana Trench is restricted. Only four human expeditions have ever reached the bottom of the trench, despite the fact that it is more than 36,000 feet deep (including James Cameron). Those fortunate enough to have had the chance to make it all the way to the bottom know that there are some fairly amazing and odd species that lurk down there!
Mariana Trench
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