Crystal Serenity cruises on amid environmental concerns

The luxury cruise liner Crystal Serenity arrived off the coast of Nome on Sunday. (Photo by Lauren Frost/KNOM)
The Crystal Serenity cruise ship is making a 32-day voyage from Anchorage to New York City.
The ship is the largest vessel ever to travel the Northwest Passage with about 1,000 passengers aboard.
Meanwhile, the potential environmental impact of a journey of that scope has some worried.
Austin Ahmasuk, a marine advocate at the Kawerak regional non-profit corporation, is nervous