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Hi All .....Im on what I think is the airboat level have been to the red building on the dock and worked my way right through to the water "locks" in the airboat. I entered the building where the armoured personell carriers are and went through 2 rooms to outside where I walked along the dock entered another room with tanks. I then went up the stairs to the door. I open the door and get to what seems to be the water canal/ lock which is surrounded by barb wire and has a gate with a round steel wheel. No matter how hard I try the wheel wont turn. I tried using the spanner from one of the rooms(garage?) but it didnt work

Please help Im stuck