In this region tugboats do more than assist ships through the harbor.

At the start and end of each shipping season you find the Helen H. in the Duluth-Superior Harbor breaking ice.

Mike Ojard, owner of Heritage Marine, describes the technique to breaking ice while freeing up the Arthur M. Anderson from CN dock 6 in Duluth on Friday, March 29, 2019.

(Samantha Erkkila /

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