This unit was designed for salvage missions at the bottom of the deepest oceans -- while Stark's conventional suits function underwater, they were noisy, inefficient, and they leaked. The exact composition unknown; it is assumed to be composed of the same layered "flex-metal" micro-scale suit tiles fabricated by genetically-engineered metal-affinity bacteria which assemble themselves in specific orderly arrays and then expire, leaving behind various metallic deposits which form all the metal shapes and micro-electronic circuits. A new aligned-crystal production process allowed the construction of a large, semi-spherical headpiece, as transparent as glass. This unit was made non-collapsible in order to increase it's protection from the pressure of the ocean depths; the armor was rated at 8,000 lbs./sq. inch, making it capable of traveling to depths of up to three miles. Power was provided by a Mark IV micro-nuclear supply pack, supplemented by solar power converters. The suit featured dual mode boot jets -- they breathed air for flight, but when underwater, silent water impellers engaged to provide movement. Air filtration and recycling systems allowed Stark to stay underwater for up to 2 days. Weaponry consisted of palm-mounted Repulsors and a chest-mounted Unibeam, along with mini-torpedoes. Sensors consisted of radar, sonar, infrared scanners, and communication was via radio. Other features included ECMs against radar and sonar, long-range grapples in the gauntets, crampons for holding on to rocks and coral so as not to lose stable footing, a holding bay in the back large enough to hold a stereo speaker, an ink-cloud reservoir (similar to the ink sac of an octopus), powerful electric shock emitters (Not unlike an electric eel´s) and an inner "Escape Suit" that could be jettisoned from the main suit in case of emergency (this inner suit possessed a Unibeam, 2 torpedoes, and the holding bay). Functions were controlled by cybernetic interface.