Built in 1999, by Dakota Creek Industries of Anacortes, Washington (hull #34) as the Tan'erliq for Crowley Marine Services Incorporated of San Francisco, California.
She was the second, of two Nanuq class tugs constructed for Crowley Marine Services Incorporated by Dakota Creek Industries.
A 153(ft), 10,192 horsepower, enhanced tractor tugs. Specially designed, and developed for Crowley Marine Service Incorporated. For service under a contract with the Alyeska Pipeline Service Company. For tanker escort operations, in Valdez Harbor, and Prince William Sound in Alaska.
The tug outfitted for tanker escort services, ship handling, firefighting, as well as, emergency, and spill response in Alaskan waters. The design includes a hydrofoil shaped skeg, welded steel construction, transverse framing, wing tanks, and ice belting.
Powered by two, twelve cylinder, Caterpillar 3612 DITA diesel engines. With two, Voith-Schneider 36 GIOI/270 cycloidal drives. The tug is rated at 10,192 horsepower.
Her electrical service is provided by two, 190kW generator sets. The tug's capacities are 124,161 gallons of fuel, and 73,968 gallons of ballast, and 70,000 gallons of recovered oil.
The towing equipment consists of a Markey DYSDS-62, split drum winch. Outfitted with 1,000(ft) of 10(in) Amsteel Blue line on the primary drum. And, 1,000(ft) Neutron 8 line, with a 250(ft) nylon pendant, on the secondary drum.