Survival at High Altitude: Wheel-Well Passengers
faa.gov
faa.gov
That's fascinating. I wonder if it means a stowaway who kept themselves warm somehow would actually suffer more damage than one who was cold?
Given the fact that they were able to get into the wheel well at all; I suppose they could've either inspected the/a well some time earlier, or even hid during a low-activity timeframe (night, etc.) before take-off (though I'd suspect they would've been discovered during pre-flight checks).
Once there, you don't need much spatial awareness to determine places to position yourself, IMO: http://cdn-www.airliners.net/aviation-photos/photos/1/8/8/17...