 From 1954, he focussed his efforts on Vasa which he located in 1956 in Stockholm harbour.Franzén had strained relations to the Maritime Museum, which for a long time seemed to regard Franzén as an unwelcome competitor, while the Swedish navy and the city of Stockholm were a lot more interested.Therefore, Franzén never worked for the Maritime Museum, but was given a position at his "alma mater" KTH, which also recognised him with an honorary doctorate in 1983, KTH's Great Prize in 1988, and a personal title as professor (approved by the Swedish government) in 1992.