trying to trace hansen family

Hello everybody I,m looking for any information about my greatgrandad Emil Hansen. I think he was born in Bodo on the 20 of May 1874,he had a sister named ragna and a brother named Haus?. His father's name was laurz olai magnus Hansen and i think they lived somewhere on the Loften islands although the name Kristiania keeps cropping up in letters i have(but their written in Norwegian so i can't figure much out from them) I know Emil Hansen worked as a ships carpenter and he was working on s.s eskimo when it was captured by the germans and he spent two years as a prisoner of war in Altdamm. I have discharge papers from all the ships he worked on and i know he married an English girl ( Mary Jane Hanson) who was from Hull in Yorkshire. I, ve tried a few genealogy sites but can't seem to find any trace of Emil or Laurz. Emil Hansen became a british national and i was wondering if this would have affected any records of him in Norway? Also does anyone know where i could find a postcard of ss Eskimo and what steps i could take next to find out about my norwegian ancestors? Any information whatsoever will be greatly appreticated as i am at a complete stop at the moment. Thank you[:)]