Built in 2002, by the Blount-Barker Shipbuilding Company of Warren, Rhode Island (hull #310) as the Sea Bull for Wittich Marine Incorporated of Bayonne, New Jersey
In 2006, she was acquired by the K-Sea Transportation Partnership of East Brunswick, New Jersey where she was renamed as the Labrador Sea.
In 2007, the tug was outfitted with an upper wheelhouse, and a JAK coupler system. The work was completed at Feeney's Enterprises Incorporated of Kingston, New York.
In 2011, the K-Sea Transportation Partnership was acquired by the Kirby Corporation of Channelview, Texas, where the tug retained her name.
Powered by two, Caterpillar 3512 B diesel engines. With Twin Disc MG-5600 reduction gears, at a ratio of 4.03:1. Turning two, 76(in) by 56(in), Kahlenburg, non-singing, stainless steel, four bladed, fixed pitch propellers. She is a twin screw tug, rated at 2,400 horsepower.
The tug's capacities are 20,600 gallons of fuel, 500 gallons of lube oil, 500 gallons of waste oil, and 2,000 gallons of water.
The towing equipment consists of a single drum, 60 horsepower, Timberland / Almon Johnson towing winch.