Making a Homemade Atmospheric Diving Suit

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I am trying to design an build my very own atmospheric diving suit similar to the one you see in the video above. The suits is like a mini submersible you can wear. That means you stay dry underwater and the suit inside is at one atmosphere preassure, eliminating all diving dangers. In trying to build one myself, I am at perfect ease. However, the prime problem encountered is the moving of the joints through rotary joints. I know the rings that seperate the strong aluminum (or steel in my design) parts that represent a human limb joint moving part are the ones that countinusly and strongly seal of the seperarted parts while allowing the stong parts to move as if they are part of the human body. How does a rotary joint work with a ring between one strong steel part and another? Any details or assistance? The one I am trying to make resembles the diving suits used in this anime tv episode below in the following parts, which are 3:38-3:56 and 6:15-8:00