I've got a little way into this level, walking through the hole in the fence, dealing with the opposition etc
After cutting through the next fence and eliminating the 2/3 guards (and hearing John Mullins say, "This must be the main road", I'm stuck . I've also eliminated, via the back window (+ shooting up all the computers) the man upstairs in the building emitting the 'radio noises'. I've tried going under the iced over river via the hole but the underwater pipe seems takes me in the other direction.
Is there a walk through available?
you should be able to travel under the iced over river via the hole... if its blocked the other way, try to shoot something to make a hole on the other side of the iced river. that way you should be able to advance.
Make your way through the fence down the hill to the iced river/stream, kill all in the area, mind for the machine gunner to the left, take out the tower which will fall into the river and break the ice, forget that you will die in the ice cold water..go to the fence at the rear and cut throgh it, make your way to the tower and open the main gates... then your in the bridge section..
Good luck :)