RCMP St. Roch is planked Douglas Fir over iron frames with ironbark sheathing. Bobbed around the Arctic for twenty years. Wintered over several years. First ship to go West to East. Can see her at the Vancouver Maritime Museum.
Gjoa was wood too.
Now over three hundred transits through the NW passage. Most of them small vessels.
https://www.spri.cam.ac.uk/resources...estpassage.pdf