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From VOA Learning English, this is the Science Report. What happened to Malaysian Airlines Flight 370 almost two years ago is still a mystery. The passenger plane was traveling from Kuala Lumpur, Malaysia to Beijing, China. The flight disappeared over the Indian Ocean. The plane held 239 people, and all are thought to have died. Experts are still looking for wreckage from the missing Boeing 777 plane. Experts think the Malaysian Airlines plane crashed in very deep waters. An American company, Phoenix International, specializes in underwater searches. It is helping to examine the waters off the western coast of Australia. The company examines large areas of the ocean floor. Parts of the Indian Ocean in the area are 6,000 meters deep. The ocean floor is not easy to explore. An Australian search report said that underwater mountains, deep holes, and very tall, sharp rocks make searching difficult. An underwater search device crashed into a tall mud volcano in January. Its rope split and the device sunk to the ocean floor. But wreckage from two ships has been found. Photographs taken underwater found a ship made of steel or iron from the 19th century. Wreckage from another ship was located in May. The only wreckage of Flight 370 found so far was a piece of the plane that washed up on Reunion Island in 2015. Reunion Island is in the western Indian Ocean near Madagascar. The search area is now limited to 60,000 square kilometers near Australia. Investigators say they will end all search efforts in June.