I won't get to see the program but from an ad I saw for it the aircraft looks like that Pegusus thing that was in Aus a couple of years ago.
Stationair8
I was pretty sure that a NASA U-2 was based in Darwin over a wet season,in about 86/87 and they used to launch off and fly through Hector starting at 5000' and working there way up at 5000' intervals until they got up 50,000'.
Nice way to spend your working day.
Knowing HECTOR, that would probably take about a minute to get from 5,000 to 50,000, if the wings stayed on.