Visible crew/equipment: At the beginning right before Santos sees the Graza, the Arctic Warrior is traveling on the sea. Off to the left you can make out the shape of another ship. Now why would that ship not have shown up on radar when Santos had said that the radar blip he saw was "10 miles to the NE"? (NOTE: you might have to kick your tv's video settings up a few notches in order to see this mistake but it is there plain as day.).