Shinkai 6500 is also made by JAMSTEC, but its ability is outstanding. Shinkai 6500 can have three passenger, usually one researcher and two pilots. Maximum speed is 2.5 knots, life support time is 129 hours (in case emergency), the staying time underwater is 8 hours (normally from the surface to the bottom). It can move through the bottom surface and researchers can observe what they see, take a photo and video. Usually, Shinkai 6500 travels from deeper sites to shallower sites around the slopes. It also equips the manipulator and other instruments that can collect some samples, or set up observational apparatus. The reason Shinkai 6500 can tolerate such an ultrahigh pressure and low temperature under 6,500 meters is the usage of titanium for its body material. Titanium is really light but strong, so it makes possible to be smaller but go deeper. Supported by the mother vessel Yokosuka, Shinkai 6500 can dive to 6500 meters about 2 hours and 30 minutes, it means that dive speed is about 43 meters per minutes. It covers about 97-98 % of the worldfs deep ocean and this is why it is called the best submersibles in the world. Most of the times, the purposes of the dives are to investigate the life of Deep Ocean, the faults by the earthquakes, prediction of marine volcanic activities or earthquakes, and sometimes the search for the gold veins. Right now, it is planning that Shinkai 6500 is used for the gProject 2007h that works out the mystery of origin of life. The only apparent problem is the restriction of the operation numbers. Shinkai 6500 can dive 60 times per year.

Lastly from Japan, I introduce two kinds of manned operated submersible made by Japan Marine Science and Technology Center (JAMSTEC). One of them is said that the most useful submersible nowadays in the world. First one is Shinkai 2000 that can go deep 2000 meters. This is operated with the mother ship Natsushima. The main operations with Shinkai 2000 were around the Pacific Ocean and the Sea of Japan. Most of the time, it investigates around the continental shelf or easily operated researches. 20 years has passed since it was built, but it is still in operation without any big trouble. The most current dive was operated in May 5th to 27th in 2001. The mother vessel left from Natsushima Bay and Shinkai 2000 explored for microbiological studies at the hydrothermal sites.

Through the century, humans develop several kinds of MOV and they have splendid capabilities. Since the recent developments of AUV or ROVs, some people still say that we do not need to brave dangers in the deep ocean by letting humans go to such a deep point. However, according to the data, in thousands of dives over a 30-year period, there have been only 3 fatalities and no loss of a DSV (6). In opposite to such a dangerous image under the deep ocean, current technologies become really safe and reliable. Since those vehicles are not well known generally, we need to expand more knowledge to non-scientific person. Based upon that thought, particularly in Hawaii and Florida, one attempt is under way. Over there, due to their large number of visitors, there are some tourist submersibles (5). The purpose of them is let tourists to see and experience the submersibles. So the depth they can dive is quite shallow, about 200 meters with 20-35 people capacities. However, this is getting popular and will be successful because several major companies begin to launch out to contribute those plans. In addition, tourist submersibles are much easier fo

Some topics in this essay:
AUV ROVs, Allyn Vine, Hawaii Florida, Barton William, Guam USNavy, Deep Ocean, II B-29, , Bay Shinkai, Usually Shinkai, deep ocean, shinkai 6500, operated vehicles, auv rovs, diving helmet, 10000 meters, shinkai 2000, 30 minutes, ultrahigh pressure, manned operated, unmanned operated vehicles, submergence vehicle dsv, deep submergence vehicle, deep ocean world, below 10000 meters,