In the world’s biggest ship recycling centre of Alang on India’s Arabian Sea coast, workers with blow torches cut segments of steel stripped from the rusting hull of a towering cargo ship, sold for scrap by its Japanese owner. But in this town - located in Prime Minister Narendra Modi’s home state of Gujarat - more than half of the ship-breaking yards have shut in the past two years and the future of the trade in India and neighbours Bangladesh and Pakistan is bleak.