Workers preparing a plane for a flight from Siberia to an Egyptian resort city discovered a mystery man hiding in one of the engines.

The Transport Prosecutor's office says the man was found in the engine of the jetliner that was to fly from the city of Kemerovo to Hurghada, Egypt, the Interfax news agency reports.

The man was in an "inadequate condition" and could not explain how or why he had crawled into the engine, the report said. It said he was taken to hospital after being discovered, but his identity has not been established.