A plane made seven flights carrying a dead man in its wheel well before crews made the grisly discovery, according to News.com.au.

The iFly Airbus A330-300 completed a flight from Italy to Moscow last Thursday when maintenance crews noticed blood stains on its landing gear.

The blood came from the remains of a man who froze to death, according to an autopsy.

“The man was apparently flying without a ticket," Russia’s Investigative Committee said.

An investigation is ongoing to see how the man ended up in the landing gears of the plane. Authorities say the man, who carried a Georgian passport, boarded the plane four days before he was found dead, News.com.au reports.

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