sentences:  Its design and construction involved 220 researchers and 1.2 million hours of scientific and industrial work.The Nahang was observed on satellite imagery at Bandar-e-Abbas on 28 June 2009 docked at the north east wharf near 27.144071 N, 56.215818 E. As there has been much discussion as to the size of the Nahang versus the Ghadir, satellite imagery clearly show the Nahang as being much shorter than the 29m Ghadir.After the Ghadir, the Nahang is Iran's second domestically produced submarine, superseded eventually by the larger Fateh and the reportedly 1000 ton Qaeem.