Yeah ... at 30 thou plus feet altitude and temperatures in the wheel well of the aircraft well below freezing this individual didn't have a chance of surviving.
On 4 June 1969, Armando Socarras Ramirez and Jorge Perez Blanco climbed into the right landing gear well of an Iberia DC-8, Flight 904 from Havana, Cuba to Madrid, Spain. Socarras survived the flight [...]
On August 5 2000, an unidentified Tahitian man was discovered in the wheel well of Air France flight 71 in Los Angeles that originated in French Polynesia and was to go on to Paris. The man spent seven hours hours inside the unheated and unpressurized landing gear at 38,0000 feet and survived temperatures of 50 degrees below zero. [...] He was flown back to Tahiti under orders from the Immigration and Naturalization Service
On June 9th, 2010, a 20-year-old Romanian stowaway survived a flight from Romania to Britain in the undercarridge of a Boeing 747 owned by a wealthy Arab sheik. He was taken into custody at Heathrow airport, where he reportedly fell out of the landing gear undercarriage. Paramedics checked him over, but he had suffered only minor injuries. It was reported he only survived because the jet flew at a lower cruising altitude of 33,000ft (rather than the standard 37,000ft) because of poor weather
Regards,