Scientists work on the Jiaolong manned deep-sea submersible aboard China`s oceanographic ship Xiangyanghong 09, June 11, 2012. The Jiaolong is scheduled to start its journey to the Mariana Trench with an attempt at the world`s first 7,000-meter dive below the surface of the Pacific Ocean. (Xinhua/Luo sha)

　　Scientists work on the Jiaolong manned deep-sea submersible aboard China`s oceanographic ship Xiangyanghong 09, June 11, 2012. The Jiaolong is scheduled to start its journey to the Mariana Trench with an attempt at the world`s first 7,000-meter dive below the surface of the Pacific Ocean. (Xinhua/Luo sha)

　　Scientists work on the Jiaolong manned deep-sea submersible aboard China`s oceanographic ship Xiangyanghong 09, June 11, 2012. The Jiaolong is scheduled to start its journey to the Mariana Trench with an attempt at the world`s first 7,000-meter dive below the surface of the Pacific Ocean. (Xinhua/Luo sha)