On 15 July, ThysssenKrupp Marine Systems' Howaldtswerke-Deutsche Werft shipyard (HDW) in Kiel, Germany, launched the first of Portugal's new Type 209PN air-independent propulsion-equipped submarines. The vessel, named Tridente , is expected in service late next year and a second unit of the class is planned for delivery in 2010. A contract for the two submarines, along with the option for purchase of a possible third boat, was awarded in 2004 at a total cost of approximately 800 million Euros ($1.225 billion). The Tridente will use an air-independent propulsion system consisting of two 120kW polymer-electrolyte-membrane (PEM) fuel cell modules and a Permasyn propulsion motor. Two diesel generators and a propulsion battery are also fitted. Displacing roughly 1,800 tons and measuring 68 meters long, Portugal's Type 209PN submarines fitted with eight torpedo tubes are expected to sail with a complement of 32 enlisted crewmembers and 5 officers.