The risk for ship accidents varies across different Arctic seas. The East Siberian Sea has been found to be most the dangerous.
The East Siberian Sea has been found to have the highest risk for ship collision, sinking of ships (foundering), and ships running aground, mostly because of more severe ice conditions, such as the earlier and quicker build-up of ice at the end of summer.
Winters are very cold in that area, with the mean temperature at -30 degrees C and the entire sea covered with ice....
http://www.highnorthnews.com/east-siberian-sea-most-dangerous-for-arctic-shipping/