sub
A submarine and probably an unmanned one at that due to pressure concerns.
submarien
The Pacific Ocean has the deepest trenches.
Trenches are the deepest parts of the ocean. Abyssal plains are the flattest parts of the ocean, but not necessarily the deepest. For the record, Marianas Trench is the deepest trench in the world, located near the Philippines.
bathyscaphe
they have special parts on and in their body parts
No the shelf is among the shallowest parts of the ocean.
The deepest parts of the ocean, known as the hadal zone, are the least explored areas on the planet. These include areas such as the Mariana Trench, the deepest part of the ocean, which has only been reached by a handful of manned submersible missions. The extreme depths, pressure, and darkness make it a challenging environment to explore fully.
They're flubber
In the deepest parts.(try the Challenger deep.)
Submarines cannot reach the deepest parts of water because of the pressure or water and deepest surface is not a smooth, its full of rocks and sea plants.
with a submarine or a machine called "Alvin"