The owner of a South Korean oil tanker was sentenced Tuesday in federal court in Hono­lulu to pay more than $1 million for knowingly dumping oily waste in U.S. waters off Hawaii.

Keoje Marine Co. Ltd. and two of its engineers from the M/T Keoje Tiger pleaded guilty to the charges of environmental crimes, which were prosecuted by the U.S. Attorney’s Environment and Natural Resources Division.

Keoje Marine was ordered to pay a $1.15 million fine, of which $250,000 will go toward the National Fish and Wildlife Foundation’s efforts to improve Hawaii’s coral reefs, the U.S. Attorney’s office said.

The company pleaded guilty to three felony counts: violating the Clean Water Act for dumping oily, bilgy waste in waters off Hawaii; covering up the dumping by falsifying the vessel’s oil record book; and for obstruction of justice during a U.S. Coast Guard inspection in October.

Bong Seob Bag, 54, chief engineer of the vessel, pleaded guilty to falsifying the vessel’s oil record book and failing to record that oily bilge waste had been directly discharged into the sea. He was sentenced to three years of probation, during which he is banned from entering the United States.

First Assistant Engineer Dwintoro, who uses only one name, pleaded guilty to falsifying record books and was sentenced to three years’ probation, during which he is also banned from entering the U.S.

Bag is a South Korean national, and Dwintoro is Indonesian, said their attorney, William Harrison.