Radar: Surface search I-band SAS Queen Modjadji is a variant of the Type 209 diesel-electric attack submarine developed by Howaldtswerke-Deutsche Werft (HDW) of Germany, currently in service with the South African Navy.

She was named after the South African Rain Queen on 14 March 2007 by the ship's sponsor, Mrs. Rita Ndzanga, at a ceremony in Emden, Germany.

[3][4] South Africa placed a contract for three Type 209/1400 submarines in July 2000 on Howaldtswerke-Deutsche Werft (HDW) and Thyssen Nordseewerke.

The Heroine class are sometimes considered to be South Africa's first "true" submarines, as they were more suited to being underwater than the Daphné models.

[7] SAS Queen Modjadji was involved in an accident on the 17 July 2012 when the submarine hit the seabed during training.