Watch VideoPlay Video
Here's more information about the technical aspects of China's first domestically designed and manufactured submersible. This makes China the fifth nation in the world to have this technology.
The "Jiaolong" submersible weighs approximately 22 tons and can carry three people. One driver and two researchers. It has set a record for the length of time working underwater - more than nine hours. This was to test all the functions of the sub more than 3-thousand meters below the surface.
The submersible is designed to dive to a depth of 7-thousand meters. It will attempt to do that soon. The outer covering is extremely firm and can handle 37-hundred tons of pressure in the sea.