Welding Chinas rockets, or how not to blink for 10 minutes

Gao Fenglin has participated in the welding of over 140 rocket engines in China. For him, the most difficult part of the job is to weld the nozzle of the engine, which contains hundreds of narrow tubes with walls as thin as 0. 33 millimeters and welding seams that can reach 1, 600 meters in length. To complete his task, Gao has not just perfected his welding technique but even trained himself not to blink for 10 minutes.