The wreck of a ro-ro that sank in the Kurushima Strait in Japan’s Inland Sea after a collision could pose a pollution threat.

It may also require a costly wreck removal.

The 11,454-gt ro-ro Byakko (built 2020) sank after colliding with the 3,497-dwt tanker Ulsan Pioneer (built 2016) near Imabari City.

The ship’s master and two officers from the Byakko are still missing.