Machinist’s Mate 1st Class Nathan Lindner was testing the newest suit designed to protect Sailors from steam leaks on nuclear-powered submarines. He pulled on thick gloves and boots, and donned a face shield for a self-contained breathing apparatus. Then he slid into the sleek, silver prototype steam suit, hoisted an air tank onto his back and connected a regulator to the breathing apparatus. Total time: a little more than two minutes.