Cheapest travel to Accra from Dublin/London?

If you have any information as to how I can travel to Accra from Dublin by land and sea please add a comment below with relevant information. Personal experiences preferable or at least interesting wewbsites. I have done research myself but would like some fresh insights. The cheapest airfare I can get at the moment is €959 with British Airways Dublin-Accra Oct. 16th rtn. July 15th. I would rather retutn August 2009 but unfortunately the fares are not yet available for purchasing through travel agents I have visited. Thanks for your help.