In Norway. An employee films the crazy waves crashing on this Norwegian oil-rig

Few days ago, during a heavy storm in the North Sea, waves got that big that they reached ‘monster wave’ sizes allowing them to splash towards the windows of this Norwegian oil-rig.
An employee film thees 15-20m waves and uploaded the images to the internet. It seems pretty scary to work in such conditions. At any moment you are afraid that a wave strong enough to affect the oil rig may come.