Body of stowaway to undergo post-mortem tomorrow

A stowaway fell to his death after hiding in the undercarriage of a UK-bound flight.

London building where stowaway's body was found after falling from aircraft. Screen print: CNN

LONDON - A formal medical examination is due to be carried out tomorrow on the body of a stowaway who fell to his death in London after hiding in the undercarriage of a United Kingdom-bound flight from Johannesburg.

The man's body was discovered on a rooftop a short distance from Heathrow Airport last week.

Meanwhile, a second man, who is thought to have stowed away on the same flight, but survived the journey, remains in a critical condition in a London hospital.

Aviation experts have already pointed to the huge risks of stowing away aboard a flight, with dangers including hypothermia, lack of oxygen and being crushed by the moving landing gear.

Now a specialist pathologist is set to carry out a detailed post-mortem examination on the man who fell from the aircraft.

It will be conducted at a hospital in Kingston, South-West London, just a short distance from where the body was discovered.

Police are still to confirm the identities and nationalities of both men who's 11 hours stowed away on the flight subjected them to altitudes of 10,000 metres and temperatures of minus 50 degrees.

Their actions have also prompted major security concerns in both South Africa and the UK.

WATCH: Stowaway found on London rooftop