Postal staff hang the name plate of Jiaolong Deep Sea Post Office at Qingdao, east China's Shandong province, June 3, 2012. The new post office is located on China's manned deep-sea submersible Jiaolong, which is going to have a 7,000-meter test dive later this month. Jiaolong Deep Sea Post Office opened on June 3 with a zip code of 266066. Its branch on the ground was set on the Jinjialing Post Office in Qingdao.[Photo/Xinhua]

A staff member of Jiaolong Deep Sea Post Office shows postcards marking the opening the new post office, Qingdao, east China's Shandong province, June 3, 2012. [Photo/Xinhua]