Built in 2016, by Miller Marine Incorporated of Deltaville, Virginia (hull #MMTUG346) as the Ms. Debbie for the Host Terminals Company of Norfolk, Virginia.
In 2020, she was acquired by Seaward Marine Services Incorporated of Chesapeake, Virginia. Where the tug was renamed as the Seaward 18.
Powered by two, Caterpillar 6135 diesel engines. She is a twin screw tug, rated at 850 horsepower.