When Lighthouse Navigation redelivered a ship to owner d'Amico Dry Cargo at the end of a charter, the vessel was not completely empty.

Rather, the open-hatch carrier arrived at Houston, Texas, with shipping containers full of pest-infested dunnage, the material used to protect cargo in the vessel's hold.

The unwanted boxes are now the subject of a legal spat between the d'Amico bulker subsidiary and Lighthouse, the commercial management arm of Oslo-listed shipowner Belships.