Atmospheric Diving Suit (JIM Suit)
JIM suit in the collection of the U.S. Naval Undersea Museum. An atmospheric diving suit (ADS) maintains surface pressure internally, protecting a diver from underwater pressure and eliminating the need for decompression. Treasure hunters developed early atmospheric diving suits to dive on shipwrecks. Commercial diving and oil drilling industries resurrected ADS in the 1960s. The JIM suit, named for test diver Jim Jarrett, was the first modern-day commercial ADS. It weighed 910 pounds and operated to 1,500 feet. The Navy began using ADS after testing the JIM suit in 1975.