 Heybeliada Island is part of the Prince Islands archipelago in the Sea of Marmara, to the southeast of Istanbul.Designed, developed and built by the Tuzla (Istanbul) Naval Shipyard as a part of the MILGEM project, it was laid down on 22 January 2007, launched on 27 September 2008, and commissioned on 27 September 2011.Istanbul Naval Shipyard Command started construction of "Heybeliada" on 22 January 2007.