Diesel Engine for Power. Where's the oxygen? (Score 1)

The article says they are going to power the comm gear with a Volkswagon Diesel engine and supplemental Solar Cells. Where are they planning to get the oxygen to support running an internal combustion engine at 60,000 feet? I would think that even with compound turbocharging you would be hard pressed to make the power you need, a supercharger would be its own power drainer.