Built in 2011, by Bollinger Shipyards of Lockport, Louisiana (hull #576) as the Ocean Wave for Crowley Marine Services of Jacksonville, Florida.
She was the first Ocean class tug built for Crowley Marine Services by Bollinger Shipyards.
Powered by two Tier II compliant Caterpillar C-280-12 diesel engines with Reintjes LAF 5666 reduction gears turning two four bladed 153.5(in) (3.9m) diameter Cu-Ni-Al controllable pitch propellers for a rated 10,880 horsepower. Her main engines are capable of being upgraded to Tier III or IV compliant. The tug is also outfitted with one Berg (Electric) VFD 850 horsepower (634kW) bow thruster.
Her electrical service is provided by one 340 kW Caterpillar C-18 Tier II compliant auxiliary generator. With two 1475 KVA shaft generators and one 125 kW Caterpillar C-6.6 Tier II generator. The generators are all capable of being upgraded to Tier III or IV The tug's capacities are 251,346 gallons of fuel oil, with the ability to handle 2,118 gallons of fuel oil overflow, 1,037 gallons of dirty oil, 1,225 gallons of oily water, 1,225 gallons of hydraulic oil, 16,868 gallons of fresh water, 6,474 gallons of oily water, 4,880 gallons of sewage, 2,900 gallons of lube oil, and 1,436 gallons of foam. The tug is double hulled ans designed to prevent overboard discharges of fuel or any fluids.
She is rated "DP 2" (Dynamic Positioning) which, is a computer-controlled system to automatically maintain a vessel's position and heading by using its own propellers and thrusters. Position reference sensors, combined with wind sensors, motion sensors and gyro compasses, provide information to the computer pertaining to the vessel's position and the magnitude and direction of environmental forces affecting its position. The Ocean Sun and Ocean Sky are 10(ft) longer than their predecessors to accommodate the "DP 2" machinery.
The towing gear consists of a INTERcon DW275 hydraulic "waterfall" style winch towing winch outfitted with 3,000(ft) of 2.5(in) wire on the upper drum and 4,200(ft) of 2.75(in) on the lower drum. She is also fitted with an auxiliary towing winch outfitted with 300(ft) of 1(in) wire. She is fitted with deck cranes, one mounted on the aft deck with a 25 ton capacity, and one mounted on the bow with a 5 ton capacity. With 200 MT Triplex wire guide pins, 350 MT Triplex "shark jaws" and a 6(ft)(1.83m) diameter full transom stern roller. With two high efficiency fire nozzles with foam capabilities.