China-Laos railway's 2nd longest tunnel drilled (2)

File photo taken on Oct. 8, 2017 shows staff members of China Railway Guangzhou Engineering Group (CRECGZ) working in the Ban Nakok Tunnel in northern Laos' Oudomxay Province. China Railway Guangzhou Engineering Group (CRECGZ) drilled through the Ban Nakok Tunnel, the second longest tunnel along the China-Laos railway, on Sunday. (CRECGZ/Handout via Xinhua)