US Navy is working on dive suit that prevents decompression
The Navy Experimental Diving Unit tested the Deep Sea Expeditionary with No Decompression (DSEND) Suit underwater last February.
The Atmospheric Diving Suit (ADS) used by the Navy at the moment is cumbersome, unmaneuverable, and requires relatively large sea craft for deployment. With this new project, it will be improved in a number of ways, including the rotary joint design that it now uses.