An undated photo shows a five-star hotel in a deep hole under construction in east China's Shanghai. The hotel is located in an 80-meter-deep stone pit which was developed by the Japanese military during the War of Resistance against Japanese Aggression. The hotel will have 370 rooms in total, with 17 floors underground, two under water and two above the ground. The construction began in 2006 and will hopefully be completed in 2017. [Photo: qq.com]