bathyscaphe
with a submarine or a machine called "Alvin"
sub
The Pacific Ocean has the deepest trenches.
Piranhas live in freshwater rivers not in oceans at any depth.
A submarine and probably an unmanned one at that due to pressure concerns.
The Marianas Trench is the deepest point of all the oceans and is located in the pacific ocean. The deepest parts of the ocean get no sunlight at all because they are so deep. This is known as the midnight zone.
The deepest parts of oceans are dark all the time because natural light does not penetrate to the ocean depths. Little is known about life in the depths of the ocean. More is known about the moon than the depths of the oceans. Water pressure is great, the temperature is constant.
They live of by eating other animals of their own type and maybe they have a great ability of not getting hungry.
Middle parts
The deepest parts of the ocean floor are caused by plate tectonic subduction and occur where the sea floor sinks back into the mantle in a subduction zone. These areas are called deep sea trenches and the Challenger Deep in the Mariana Trench in the Pacific is the deepest known point in Earth's oceans.
The deepest parts of oceans are dark all the time because natural light does not penetrate to the ocean depths. Little is known about life in the depths of the ocean. More is known about the moon than the depths of the oceans. Water pressure is great, the temperature is constant.
Niche