Maine is known for its beautiful bodies of water. In the winter its up to the U.S. Coast guard to make sure the water is clear for travel and commerce.

That's why they were out breaking ice on the Penobscot River Friday.

"We want to make sure that we keep ports, facilities, commerce open. Heating oil needs to continue to flow. Ferry traffic needs to continue," Chief Petty Officer Einar Mattson said.

"Our job is, come Springtime, to prevent inland flooding," Seaman Daniel Schott said.

Using an "Icebreaker" boat, the crew of seven cut through a mile of ice over the span of a few hours. The boat's hull is sharp enough to break through several inches of ice without any trouble.

This is a part of a special mission in the Northeast called Operation R.E.N.E.W. It stands for "Reliable Energy for Northeast Winters."