From January through April 2017 the Perlan team kept a low profile while working on upgrades for the Perlan 2. Here's a partial list of improvements that are ready for Campaign Two in Argentina. Probably most significant is the ability to seal the cabin for pressurization while in flight. This allows air circulation with cooling and drier air during the hour-long tow from El Calafate. Now the desiccants can easily keep up with the increased humidity from two pilots wearing insulated cold weather flight suits. Jim developed the concept and Andrew Oullet designed the hardware. John Kregl from Automated Metals manufactured the parts for the new system, and Greg Scates installed and reinforced the new latches. Hangar testing went very well. The good news is that it worked flawlessly on the first test flight from Minden.