Built in 1907, by Neafie and Levy Engine Building Company of Philadelphia, Pennsylvania (hull #1011) as the Bern for the Reading Railroad Company of Philadelphia, Pennsylvania.
In 1949, she underwent a major refit at Speddin Shipyard in Baltimore, Maryland. Her steam engines, and engine room equipment were replaced with engines from two salvaged military Landing Ship Tanks (LSTs).
In 1952, the tug was acquired by the Independent Pier Company of Philadelphia, Pennsylvania. Where the tug was renamed as the Saturn.
In 1972, the tug sank. Although, she was later raised, and repaired.
In 1983, the Independent Pier Company was acquired by the McAllister Brothers Towing Company of New York, New York. Where she was renamed as the Muriel McAllister.
In 1989, the tug was acquired by the Eastern Towboat Company of Boston, Massacusetts. Where she was renamed as the Saturn.
In 1997, the tug was acquired by an individual or company called Testa. She was then acquired by MRP Site Development of Lynn, Massachusetts. Where the tug retained her name.
The tug was eventually acquired by another individual by the name of Melissa D. Terry. Where she retained her name.
She was later acquired by and individual named Jon B. Johansen of Winterport, Maine. Where the tug retained her name.
In 2020, the tug was scrapped.
The tug was single screw, rated at 525 horsepower.