and neoprene boots. In 30 °C water the suit was reported to be uncomfortably hot during heavy work. As technology improved and operational knowledge grew, Oceaneering upgraded their fleet of JIMs. The magnesium construction was replaced with glass-reinforced plastic (GRP) and the single joints with segmented ones, each allowing seven degrees of motion, and when added together giving the operator a very great range of motion. In addition, the four-port domed top of the suit was replaced by a transparent acrylic dome as used on WASP, this allowed the operator a much-improved field of vision. Trials were also carried out by the Ministry of Defence on a flying Jim suit powered from the surface through an umbilical cable. This resulted in a hybrid suit with the ability of working on the sea bed as well as mid water. In addition to upgrades to the JIM design, other variations of the original suit were constructed. The first, named the SAM Suit (designated A.D.S III), was a completely aluminium model. A smaller and lighter suit, it was more anthropomorphic than the original JIMs and was depth-rated to . Attempts were made to limit corrosion by the use of a chromic anodizing coating applied to the arm and leg joints, which gave them an unusual green color. The SAM suit stood at in height, and had a life support duration of 20 hours. Only three SAM suits would be produced by UMEL before the design was shelved. The second, named the JAM suit (designated A.D.S IV), was constructed of glass-reinforced plastic (GRP) and was depth-rated for around . WASP The WASP atmospheric diving system is part way between a one person submersible and an atmospheric diving suit, in that there are articulated arms which contain and are moved by the operator's arms, but the operator's legs are contained in a rigid housing. Mobility is provided by two vertical and two horizontal foot-switch controlled electrical marine thrusters. Operating depth was quoted as WASP is high, wide, and front to back. Ballasted weight in air approximately , for neutral buoyancy in water, but buoyancy can be increased by up to during operation, and ballast can be jettisoned in an emergency. WASP is transported on a support frame. Current suits In 1987, the "Newtsuit" was developed by the Canadian engineer Phil Nuytten, and a version was put into production as the "Hardsuit" by Hardsuits International. The