The Iranian oil tanker Sanchi has sunk off the coast of Shanghai after a powerful explosion, taking with it hopes for finding the 29 crew members still unaccounted for.

Surveillance footage from Sunday noon shows the blast was followed by flames reaching over 800 meters high. Dense plumes enveloped the vessel. The body of the ship was later confirmed sunk, with over one-hundred-thousand tons of light crude oil condensate. The Sanchi collided with a Hong Kong freighter over a week ago. So far, only three bodies of its 32-member crew have been found. The rescue team also recovered the ship's black box.