According to an official concerned, thanks to the great enthusiasm of builders, it took a little more than two months to carry out cylinder caisson projects for the intake of geothermal water 70 percent after the groundbreaking, with annexes framed at over 40 percent.

The North Hwanghae Provincial Brigade completed the Rungna cylinder caisson No. 1 within 20 days and is speeding up the projects for cylinder caisson Nos. 2, 3 and 4.

The Rason Municipal Brigade strives to build underground structures in quality, while the South Hwanghae Provincial Brigade concentrates its manpower on preparations for piping project.