It's moment's like this that make me wonder why science fiction populates other planets with life - when we have our own undiscovered world right here.
The Mariana Trench is the deepest part of the world's oceans - that we know of. If you were at the bottom of this trench, you would be further from sea level than if you were at cruising altitude on an international flight.
That tiny, tiny black dot on the surface? A person. Below, a blue whale. Click to get a better view.