Finnish icebreaker docks in Greenland

Master Mariner Jyri Viljanen, captain of the Finnish icebreaker MSV Nordica, looks out from the bridge after docking the ship in Nuuk, Greenland, as it arrives after traversing the Northwest Passage through the Canadian Arctic Archipelago, Saturday, July 29, 2017. After 24 days at sea and a journey spanning more than 10,000 kilometers, the MSV Nordica has set a new record for the earliest transit of the fabled Northwest Passage. The once-forbidding route through the Arctic, linking the Pacific and the Atlantic oceans, has been opening up sooner and for a longer period each summer due to climate change. [Photo：AP/David Goldman]

The Finnish icebreaker MSV Nordica is docked in Nuuk, Greenland, after traversing the Northwest Passage through the Canadian Arctic Archipelago, Saturday, July 29, 2017. After 24 days at sea and a journey spanning more than 10,000 kilometers, the MSV Nordica has set a new record for the earliest transit of the fabled Northwest Passage. The once-forbidding route through the Arctic, linking the Pacific and the Atlantic oceans, has been opening up sooner and for a longer period each summer due to climate change. [Photo：AP/David Goldman]

Researcher Daria Gritsenko steps onto land for the first time since setting sail aboard the Finnish icebreaker MSV Nordica as it arrives into Nuuk, Greenland, after traversing the Northwest Passage through the Canadian Arctic Archipelago, Saturday, July 29, 2017. After 24 days at sea and a journey spanning more than 10,000 kilometers, the MSV Nordica has set a new record for the earliest transit of the fabled Northwest Passage. The once-forbidding route through the Arctic, linking the Pacific and the Atlantic oceans, has been opening up sooner and for a longer period each summer due to climate change. [Photo：AP/David Goldman]

Trainee David Kullualik looks out as the Finnish icebreaker MSV Nordica arrives into Nuuk, Greenland, after traversing the Northwest Passage through the Canadian Arctic Archipelago, Saturday, July 29, 2017. After 24 days at sea and a journey spanning more than 10,000 kilometers, the MSV Nordica has set a new record for the earliest transit of the fabled Northwest Passage. The once-forbidding route through the Arctic, linking the Pacific and the Atlantic oceans, has been opening up sooner and for a longer period each summer due to climate change. [Photo：AP/David Goldman]

Tiina Jaaskelainen, second from left, and fellow researchers look out from the Finnish icebreaker MSV Nordica as it arrives into Nuuk, Greenland, after traversing the Northwest Passage through the Canadian Arctic Archipelago, Saturday, July 29, 2017. After 24 days at sea and a journey spanning more than 10,000 kilometers, the MSV Nordica has set a new record for the earliest transit of the fabled Northwest Passage. The once-forbidding route through the Arctic, linking the Pacific and the Atlantic oceans, has been opening up sooner and for a longer period each summer due to climate change. [Photo：AP/David Goldman]