28 years ago today, September 10, 1997 (August 9, 1997), China's longest land-based gas pipeline was completed. September 10, 1997 Shaanxi natural gas pipeline project was completed. The project began in May 1996, with a total investment of $39.5 billion, the total length of the pipeline is 853.23 km, is China's longest land-based gas pipeline, and is China's first large-caliber, long-range, fully automated gas pipeline.