Submarine
This ship was made in the early 1960s by the American navy, with a length of about eight meters, a capacity of 3 people, and is able to dive up to 4000 meters. the ability of the latter Setra by quadrupling the existing board a military submarine. Alvin, many deep-sea research submarine made, among others, the Shinkai 6500 made by the Japanese in 1989. The vessel is capable of diving to a depth of 6400 meters. United States and Japan continue to develop this type of submarine.
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