Khaysone Phomvihane's cave

Entrance to the meeting room of the Party's Central Committee, at Khaysone Phomvihane's cave.
The natural caves were enlarged by hand and tunnels blasted with dynamite. Five feet thick blast walls were built to protect cave entrances and to prevent rockets and guided missiles from entering. Supplying the headquarters in Vieng Xai with food, building materials, weapons and ammunition during the conflict was an enormous task. Trucks transported goods from the Soviet Union, China and Vietnam through North Vietnam into Laos at the border, 55km from Vienxai.
13. Limestone Karst scenery in Vieng XaiAs most bombing occurred during the day, the trucks drove at night. In 1970, emergency rooms were built in many of the caves, and fitted with an air filter machine because of the fear of chemical attack.