The furthest that human beings have been away from home is somewhere between 356,400 km to 406,700 km. That’s the range in the Moon’s orbit, and 12 people have made it that far to walk on the surface. In contrast, Challenger Deep in the Mariana Trench near Guam in the Pacific Ocean, at just shy of 11,000m (11km) is the deepest point that human beings have directly seen. There have only been two people who have been there, and that was back in 1960.
Two oceanographers, Swiss Jacques Piccard, and American Don Walshmade it to that
Walsh and Picard in The Trieste
depth in the bathyscaphe Trieste in that historic journey. Since then there have been numerous unmanned voyages, but after more than 50 years, these two remain alone in their accomplishment. Picard died in 2008, leaving 8o year old Walsh as the sole ultimate submariner.
Trieste being lowered into the ocean
The BBC has put together an interactive graphic that outlines the ocean zones. Here are some screen shots from the graphic.
Sunlight Zone
Trenches Zone - 6,000 and deeper
Challenger Deep
To put the ocean depths into perspective, the diameter of our planet is over 6,300km at the equator. That’s almost 630 times further than Challenger Deep to the centre of the inner core.
There is a greater probability that humans will walk on the surface of Mars than we will ever get to the centre of our own planet.
via Mano Singham000
11,000m
If they went 11,000km they’d pop out the other side and it would look like Mercury. 
Fixed. Thanks for the catch.