According to a list of research proposals from the U.S. military’s blue-sky researchers at Darpa, the agency is seeking “integrated microsystems” to detect and control “warfighter physiology for military diver operations.” Essentially it comes down to hooking divers up to sensors that can read both their bio-physical signs and the presence of gases like nitric oxide, which help prevent decompression sickness, commonly known as “the bends.” If those levels dip too low, the Darpa devices will send small amounts of the gases into divers’ lungs to help keep them swimming.