China Plans To Build A Deep-Sea 'Space Station' In South China Sea (huffingtonpost.co.uk)
China is ramping up its space efforts, it appears. A Chinese company named KuangChi Science plans to launch balloons from Hangzhou, in eastern China. HuffingtonPost reports: China is stepping up efforts to build a deep-sea underwater 'space station' in the South China Sea. If the plans go ahead, the station would be located 3000 metres below the surface, inhabited by humans, and would be used to hunt for minerals. There are also concerns that it would be used for military purposes in territories that are hotly contested between China and other nations, including the Philippines, Vietnam and Japan. The news comes from a Science Ministry presentation that revealed China's current five-year economic plan (till 2020). Despite no further details or blueprints being made public, the presentation ranked this project as second in a list of 100 science and technology priorities according to Bloomberg.
A permanent sea habitat, and a space station, have vastly different engineering requirements.
For starters, a sea habitat has to withstand positive pressures, and ocean current flows. (At the depth specified, a strong storm swell will shake the habitat pretty good.)
Meanwhile a space habitat needs to be lightweight for launch cost reasons, needs to protect against radiation, and withstand negative pressures well. The sanitation and sleeping arrangements need to consider microgravity.
About the only things the two will have in common are airlocks, power generation, and air reprocessing.
Sealab 2020, China Edition looks like it is just another lame excuse for actions in the contested south china sea.
On other parts of the internet there is a lot of skepticism about China's stated goals for this facility. It smells strongly of manganese nodule harvesting and many analysts think it has a military or intelligence purpose instead. The details that have been released are so sketchy it's hard to believe that it's a legitimate scientific facility, but I guess it's not impossible.
I read the internet for the articles.
There is no gas humans can breath and survive on at 30 MPa pressure. Hydrox was barely survived (in COMEX experiments) at 7 MPa pressure. No, a deep-ocean habitat at 3000m would certainly contain ordinary "1 bar air", and need to have very very strong casing and very very dependable sealing.
Not sure if mining minerals that deep is in any way economic, China has way easier access to minerals with full disregard about the ecological consequences. Just like mining asteroids, the deep sea is too expensive to access for the foreseeable future.
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The thin layer of atmosphere may prove defense-less against threats like Gamma Ray Burts, and colonizing Mars won't save us from them. Learning to live under sea, and building cities deep underwater for reducing the likelihood of our extinction from some types of very low probability catastrophic events is just as important colonizing Mars.