In reply to wintertree:
> Air on the summit is about 50 times thicker than on Mars, and a helicopter drone has flown on Mars.
> It’s a lot easier if you don’t have to haul squishy meat bags and their life support around.
Not counting how much it cost in development of a rocket to get to Mars and then a Rover to land on solid ground, it cost about $80m to design the drone and about $5m to operate the little autonomous aircraft at an atmosphere 50 times less than the summit of Everest.
I'd say £3k for an off the shelf drone is quite reasonable, provided you have £3k to spend after paying the Park fees, porters, equipment and other stuff like bog roll.