00:55

China's deep-sea manned submersible Jiaolong started its test dives at the National Deep Sea Center in east China's coastal city of Qingdao on Thursday after getting its first major upgrades installed. After the indoor test dives, the submersible will be taken out to sea for maritime trials. Once it passes all tests, the Jiaolong will then embark on its new ocean adventure with its carrier Shenhai Yihao (Deep Sea No. 1).