Divers who come up too fast can get the "bends." The body decompresses as it surfaces, which can cause sickness and death. Darpa, the military research agency, is working on a suit for military divers that will stabilize the gases in their bodies, enabling deeper, longer dives. Darpa plans to use sensors to read physiological conditions and administer trace amounts of stabilizing nitric oxide to the diver's lungs. The suit could eventually be used by civilian divers too.