Russia is planning huge oil and gas developments in the Arctic Ocean off its northern coast - drilling that could threaten pristine wildlife habitats.
The early retreat of ice makes life harder for the polar bear and walrus
Large-scale production could begin in the next two decades, if the price of oil rises high enough.
Preliminary exploration has already begun, including in the Laptev Sea.
But scientists say the region is home to important, thriving populations of walrus and polar bears, which could be put at risk.
Biologists on the 2013 Laptev Expedition this summer have been trying to establish if the walruses and polar bears there are a unique group, in need of special protection. BBC journalists went with them to investigate the issue.
We flew to Khatanga, one of the most northerly towns in Siberia, and there we boarded a small boat, the Taimyr.
From Khatanga it was a two-day, 500km (310-mile) journey almost due north.
Darts are used to collect vital samples from the walrus
Polar bears
After the first day it became clear we had entered the domain of the polar bear. First we saw a mother with two five-month-old cubs on Maliy Begichev Island.
Then we saw a big "haul-out" of walrus at Cape Tsvetkov - perhaps 400-600 there, resting on the beach. Towering above them on the last large lump of ice was a large polar bear.
But our destination was Maria Pronchishcheva Bay, half-way up the Taimyr Peninsula. It is the most northerly bit of land in the world still attached to a continent.
"The oil companies are coming here with exploration projects already, and there are ongoing seismic explorations," said Igor Chestin, chief executive of the environmental group WWF Russia.
"So before the real oil and gas projects develop in the area we need to know that there is sufficient knowledge of the conservation needs here, which would allow us to put in the necessary protection if this development ever happens."
From satellite photographs taken a week earlier, the scientists on the expedition knew there had also been a large walrus "haul-out" there previously. By the time we sailed into the bay the number had dropped to around 60. But it was still enough for the crucial scientific work of the expedition - collecting DNA from the Laptev walrus.
From BBC Environment
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