Dangerous mission down below

It is one of the most dangerous professions in the world and Chu Jinyong has been doing it for nine years.

Working as a diver with China National Offshore Oil Corporation since 2005, Chu has dived to depths of tens of meters underwater, in the pitch black, to install and maintain offshore gas and oil facilities over nearly 800 hours. His team of 41 divers has laid pipelines across 3,290 kilometers of seabed.

It is highly skilled and technical work, and if anything goes wrong, it can mean the difference between life and death. The 36-year-old diver has narrowly escaped being killed twice.