Photo taken on July 27, 2016 from Chinese deep-sea explorer ship, Zhang Jian, shows a scenery at the northwestern Pacific Ocean. Zhang Jian sailed into northwestern Pacific Ocean on Tuesday. Its destination is the waters of the New Britain Trench, which is more than 8,000 meters deep in the Solomon Sea off Papua New Guinea. (Xinhua/Zhang Jiansong)

Photo taken on July 27, 2016 from Chinese deep-sea explorer ship, Zhang Jian, shows a scenery at the northwestern Pacific Ocean. Zhang Jian sailed into northwestern Pacific Ocean on Tuesday. Its destination is the waters of the New Britain Trench, which is more than 8,000 meters deep in the Solomon Sea off Papua New Guinea. (Xinhua/Zhang Jiansong)

Photo taken on July 27, 2016 from Chinese deep-sea explorer ship, Zhang Jian, shows a scenery at the northwestern Pacific Ocean. Zhang Jian sailed into northwestern Pacific Ocean on Tuesday. Its destination is the waters of the New Britain Trench, which is more than 8,000 meters deep in the Solomon Sea off Papua New Guinea. (Xinhua/Zhang Jiansong)

Photo taken on July 27, 2016 from Chinese deep-sea explorer ship, Zhang Jian, shows a scenery at the northwestern Pacific Ocean. Zhang Jian sailed into northwestern Pacific Ocean on Tuesday. Its destination is the waters of the New Britain Trench, which is more than 8,000 meters deep in the Solomon Sea off Papua New Guinea. (Xinhua/Zhang Jiansong)

Photo taken on July 27, 2016 from Chinese deep-sea explorer ship, Zhang Jian, shows a scenery at the northwestern Pacific Ocean. Zhang Jian sailed into northwestern Pacific Ocean on Tuesday. Its destination is the waters of the New Britain Trench, which is more than 8,000 meters deep in the Solomon Sea off Papua New Guinea. (Xinhua/Zhang Jiansong)