The Russian captain of a cargo ship that collided with a U.S. tanker earlier this week appeared in a U.K. court Saturday where he was remanded in custody over the death of a crew member, who is missing and presumed dead.

The captain of a cargo ship that collided with an oil tanker in the North Sea has appeared in court charged with gross negligence manslaughter over the death of a crew member. The Portuguese-flagged Solong and US-registered tanker Stena Immaculate crashed off the East Yorkshire coast at about 10:00 GMT on Monday.

The captain of the Solong cargo ship who was arrested after crashing into an oil tanker off the English coast is a Russian national, the vessel’s owner said Wednesday, as maritime experts search for answers.