Japan’s Kansai International Airport (KIX) has won international awards for its architectural design, efficiency and staff, and was recognised last year as the best airport in the world for baggage delivery after not mislaying a single item of luggage for a decade. Despite all the plaudits, KIX has a major drawback: it is sinking.Built on a man-made island in Osaka Bay, KIX was one of the largest construction and engineering projects ever undertaken in Japan. Made up of two islands, one...