 The S/UME-100 tactical ESM antennas interface to the optronics mast and attack periscope.It is believed that the submarines are fitted with the CIRCE torpedo counter-measure ejector system.The submarines are fitted with a diesel electric propulsion system based on four MTU 12V 396 diesel engines delivering 2.8MW, with four alternators and one Siemens 3.7MW motor, driving a single shaft.