One of the more interesting materials proposed for shipbuilding to save steel, was ice/sawdust. Apparently not quite as impractical as it sounds. https://en.wi

One of the more interesting materials proposed for shipbuilding to save steel, was ice/sawdust. Apparently not quite as impractical as it sounds. https://en.wikipedia.org/wiki/Pykrete https://en.wikipedia.org/wiki/Pykrete