precision [Music] this is I this site needs to fit now it fits first of all a welder joins the various sections loosely together they're made of a very special material it's a cute print achill ferrous alloy the ship's engine is exposed to salt water but that can't affect this pipe welding curved sections while the workpiece is turning is a big challenge for any welder the seam has to be absolutely watertight if any sea water got into the engine it would destroy it the final pipe for the engine block is now ready it has been a long road over