Workers transport China's manned submersible Jiaolong to its mother ship the "Xiangyanghong 09" scientific exploration ship in Jiangyin, east China's Jiangsu Province, May 31, 2012. The Jiaolong would challenge a 7,000-meter dive to the Mariana Trench on June 3. [Xinhua]

Workers transport China's manned submersible Jiaolong to its mother ship the "Xiangyanghong 09" scientific exploration ship in Jiangyin, east China's Jiangsu Province, May 31, 2012. The Jiaolong would challenge a 7,000-meter dive to the Mariana Trench on June 3. [Xinhua]

Workers transport China's manned submersible Jiaolong to its mother ship the "Xiangyanghong 09" scientific exploration ship in Jiangyin, east China's Jiangsu Province, May 31, 2012. The Jiaolong would challenge a 7,000-meter dive to the Mariana Trench on June 3. [Xinhua]

Workers transport China's manned submersible Jiaolong to its mother ship the "Xiangyanghong 09" scientific exploration ship in Jiangyin, east China's Jiangsu Province, May 31, 2012. The Jiaolong would challenge a 7,000-meter dive to the Mariana Trench on June 3. [Xinhua]