The black box for an ill-fated tanker that sank off China’s shores last week as well as that of a freighter with which it collided were opened at the presence of representatives from related parties in Shanghai on Wednesday.

A portable camera carried by Chinese rescuers who boarded the burning oil tanker Sanchi captured live moments of their search for survivors and the black box of the ship.

China says an Iranian tanker that collided with a freighter and sank after burning for more than a week in the East China Sea has produced two oil spills.