Fridtjof Nansen class — significant dates Pennant number Name Ordered Laid down Launched Commissioned F310 Fridtjof Nansen 23 June 2000 9 April 2003 3 June 2004 5 April 2006 F311 Roald Amundsen 23 June 2000 3 June 2004 25 May 2005 21 May 2007[8] F312 Otto Sverdrup 23 June 2000 25 May 2005 28 April 2006 30 April 2008[9] F313 Helge Ingstad 23 June 2000 28 April 2006 23 November 2007 29 September 2009 F314 Thor Heyerdahl 23 June 2000 23 November 2007 11 February 2009 18 January 2011