A file photo of the 816 Nuclear Military Plant in southwest China's Chongqing municipality. [Photo: sina.com.cn]

The 816 Nuclear Military Plant in southwest China's Chongqing municipality has reopened its doors to the public, after a year of modification works.

This abandoned nuclear plant has been regarded as the world's largest artificial cave and the country's only former nuclear engineering site that has been opened to the public as a tourist attraction.

Local officials told China News Agency, that the site will offer a perfect integration of history and modern technologies after the reconstruction efforts.

The site will also implement sound and lighting effects as part of its update in order to create a better sense of participation for visitors.

The 2001 process pipelines in the nuclear reactor hall have been restored, and are designed to demonstrate the process of nuclear fission through the photoelectric effect.

Construction of the China 816 Nuclear Military Plant, once a highly confidential military site in the mountainous town of Baitao in Fuling District, began in 1966, but the Central Military Commission called off the project in 1984 because the situation in the world was relatively peaceful at the time.

The cave was designed to withstand thousands of tons of explosives and even 8.0 magnitude earthquakes.