Pictured as: the Mary H. (Bren Transportation Company) Photo by: Birk Thomas

Built in 1981, by the Marlin Marine Corporation of Houma, Louisiana (hull #4) as the Joan Cenac for the Cenac Towing Company of Houma, Louisiana.

In 1987, the tug was acquired by the Bren Transportation Company of Brooklyn, New York. Where she was renamed as the Mary H.

Powered by two, Detroit Diesel 16-71 diesel engines. With Twin Disc MG 527 reduction gears, at a ratio of 5.17:1. Turning two, four bladed, fixed pitch propellers. She is a twin screw tug, rated at 1,200 horsepower.

In 2020, the tug was repowered with two, Cummins K-19 diesel engines. With Twin Disc MG 527 reduction gears, at a ratio of 5.17:1. Turning two, four bladed, fixed pitch propellers. She is a twin screw tug, rated at 1,200 horsepower.

Her electrical service is provided by two, 30kW, International E7101 generators. Driven by two, Detroit Diesel 1671 diesel engines. The tug's capacities are 7,876 gallons of fuel, 125 gallons of lube oil, and 6,016 gallons of water.