BRASLIA: Antonio Sena was flying a single-prop Cessna 210 over the Brazilian Amazon when the engine suddenly stopped, leaving him minutes to find a spot in the jungle to crash-land. He survived with no injuries, but was stranded in the middle of the world’s largest rainforest — the start of a 38-day trek he says taught him one of the biggest lessons of his life. Sena, 36, was hired to fly a cargo run from the northern town of Alenquer to an illegal gold mine in the rainforest, known as the “California”. Flying at an altitude of about 3,000 feet, he knew when the engine stopped halfway he did not have much time.