The first underwater tunnel in #Bangladesh, the left line of the Karnaphuli River bottom tunnel project, was drilled through on Sunday with China-developed super-diameter slurry-pressure-balance tunnel boring machine (TBM). The TBM weighs 2,200+ tons, with a diameter of 12.12m.

The first underwater tunnel in #Bangladesh, the left line of the Karnaphuli River bottom tunnel project, was drilled through on Sunday with China-developed super-diameter slurry-pressure-balance tunnel boring machine (TBM). The TBM weighs 2,200+ tons, with a diameter of 12.12m.