Despite the corruption scandal surrounding China’s high-speed rail network and calls from some quarters for a pause for breath in its breakneck expansion, the superlatives continue to rack up. Add to the list, the fastest underwater trains. Strictly speaking, the existing record is yet to be broken. But the tunnel through which the trains will run has been built, Xinhua reports. Its stretches for 10.8 kilometers under the Pearl River estuary on the run from Guangzhou to Shenzhen and Hong Kong that will open next year. Trains will be able to speed through it at a record-setting 350 kph, with the trip between Guangzhou to Hong Kong cut to 40 minutes from the current two hours.