The size of the Mariana Trench
To even comprehend all the weird stuff that’s going on in the Mariana Trench, we must first understand its sheer size. It’s easy to think that the place is just some deep, watery hole where a few creepy bioluminating critters hang about. In reality, however, the Mariana Trench is absolutely massive. It’s no less than 1,580 miles long and 43 miles wide, which understandably makes its exploration an incredibly daunting task even if you ignore the water pressure and the terrifying-looking lifeforms that lurk within its depths, which extend all the way down to roughly 36,000 feet below the surface at the trench’s deepest point, the Challenger Deep.
The Trench is technically U.S. territory, but since a giant, super-deep ocean hole that contains all sorts of strange ecosystems is obviously fairly vulnerable to human tampering, President George W. Bush declared it a “marine national monument” in 2009. This means that the majority of the Mariana Trench, along with a whole bunch of surrounding seafloor and several underwater volcanoes, are a protected marine reserve.