Have you ever gone snorkeling or scuba diving? I've been snorkeling and yes it fascinating but a little creepy to me as well. This video might explain why.

We all know that the oceans are big and deep, but just how deep? This video will put it into perspective. It's really, really, really deep! Yeah, I think there just might be monsters down there!

The video mentions the Mariana Trench. I didn't know anything about it so I looked it up.

The Mariana Trench is located in the Pacific Ocean close to Guam. According to Geology.com:

The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level with an estimated vertical accuracy of ± 40 meters. If Mount Everest, the highest mountain on Earth, were placed at this location it would be covered by over one mile of water.

The Challenger Deep was first explored by humans when Jacques Piccard and Don Walsh descended in the Trieste bathyscaphe in 1960. They reached a depth of 10,916 meters (35,814 feet).

In 2009 researchers from Woods Hole Oceanographic Institution completed the deepest dive by an unmanned robotic vehicle in the Challenger Deep. Their Nereus robotic vehicle reached a depth of 10,902 meters.