System for loading and unloading of hydrocarbons in waters with varying conditions, comprising an icebreaking vessel (10) moored to a sea bed (12) by means of a turret buoy (11) and where a tanker (16) by means of at least one hawser (17) is moored with its bow to the aft end of the icebreaker either at a distance from the icebreaker (10) in situations without influence from ice, or in physical contact with the icebreaker in situation when ice is present. The system further comprises at least one hose (24) and valve system for transferring hydrocarbons from the icebreaker (10) to the tanker (16).