Down goes the tanker.

An Iranian tanker carrying condensate collided with a Chinese freight ship on Saturday which is still burning and could burn for a month. The South Korean Ministry of Oceans said there are fears that the tanker could explode, making it even harder to clean up any spilled condensate and find the missing members of the tanker’s crew. One body was found on Monday but 31 crew members remain missing.

The tanker, the Sanchi, was carrying condensate to South Korea when it collided with a Chinese freighter in the South China Sea on Saturday, catching fire. The U.S. Navy joined search and rescue efforts on Sunday, sending a military aircraft to the area, which spans 3,600 square miles. The vessel’s cargo is worth around $60 million in the US at current oil prices.

The Panama-registered Sanchi carried 136,000 tons of condensate, which the Chinese authorities said would quickly evaporate when it reaches the water, leaving little residue.

Condensate is highly flammable and very toxic, which could create a different kind of problem for the search and rescue teams around the vessel, whose task has been already made extra-difficult by the stormy weather.

An earlier report stated worries on the part of the Korean authorities about the possibility of a bunker fuel spill in case the tanker explodes or sinks. They estimate that the vessel could continue burning for another two to four weeks based on previous tanker accidents.