After a British Airways flight from Johannesburg to London touched down at Heathrow airport, they discovered a stowaway clinging to the undercarriage of the aircraft. The body of another man was also discovered on the roof of a London office directly underneath that same airplane’s flight path.

Although the stowaway is still alive, the police have yet confirm whether the stowaway and the body are connected. The stowaway is in critical condition.

The possibility that not just one, but two people stowed away on an airplane for 10 hours is mind-boggling when you consider the risk. The wheel well and baggage hold of an airplane are far less comfortable than simply flying coach. Anyone who stows away in those areas is more likely to freeze to death or die from a lack of oxygen then to fall out of the plane, let alone stick the landing.

Oddly enough, there is a precedent for people stowing away and tumbling out of airplanes. As recently as 2012, a man from Mozambique died in West London after spending 11 hours in the wheel well of a plane. There are even statistics surrounding the issue. According to the U.S. Federal Aviation Administration, one in four stowaways survive the trip. The other three die or fall in transit.

The next time you need to fly somewhere, for the love of God, buy a plane ticket.