Lu'an Group has tested an underground refuge chamber at the Changcum coal mine in Jilin, China, which can be used during rescue operations.
A group of 80 miners, rescue workers and researchers stayed in the refuge chamber for 48 hours, in safe conditions, during the test.
The chamber will protect trapped miners from harmful, toxic gases during any underground disaster, and has been designed to carry 80 to 100 people, reports People's Daily Online.
The chamber provides protection from explosion and consists of an enclosed space, air monitor, carbon dioxide absorber, temperature and humidity controller, communications equipment and supplies of power, oxygen, food and water.
Lu'an Group general manager Liu Rensheng told local reporters that the miners were able to communicate with the ground control centre via an indoor communications system and conduct two-way video conversations in order to provide follow-up rescue work.