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The Indian Ocean has a mean depth of nearly 3,890 metres (the tallest building in the world, Burj Khalifa is only 828 metres) which tells how much difficult the challenge is.
The Beijing-bound plane had 239 people on board, mostly from China. Over 25 countries searched it over two weeks across the South and South-east Asia and several theories made rounds about the possible reason for its disappearance.
On March 24, Malaysian Prime Minister Najib Razak officially declared that satellite experts concluded from the available evidence that the flight had crashed into southern Indian Ocean and there were no survivors.