Chinese engineers have designed the country’s first tourist submersible equipped to venture as deep as 1,000 metres (3,280 feet) below the ocean surface, giving eventual new momentum to the luxury travel industry. Engineers at the China Ship Scientific Research Centre in Wuxi, a city west of Shanghai, plan to build a prototype before the end of the year and enter commercial operation by 2030 for as many as four passengers per trip, state-run media outlets said this week. Key components including...