Secrets of the world's oceans, mysteries of the oceans.
Until now, we know about the world ocean depths less than about space.
Descend into the Mariana Trench is much more dangerous and more difficult to run than a spaceship with people around the earth.
Dark and cold depths of the ocean is still inaccessible to people.
Enormous pressure on many kilometers depth
all this makes inaccessible visit
seabed, at great depth.
In the Red Sea, scientists have discovered a deep canyon, which until recently was unknown time.