Many people assume that there are no unexplored places left on our planet. But ask any adventurer and they'll tell you there's one final frontier that's never been tamed: the vast depths of our oceans. With a planet covered by around 70% water, it's almost no surprise that huge amounts of it has never even been seen by man. And the Pacific Ocean is the biggest of them all.
The Pacific Ocean goes down to mind-blowing depths: at its deepest point, the Mariana Trench, it's close to 7 miles down. Humans have literally only scratched the surface of this incredible seascape, so there's really no better place to hide an alien base on Earth. Especially if, as we believe, these aliens have the technology to withstand the crushing pressure at such depths.