IDAS (Interactive Defence and Attack System for Submarines) is a medium-range missile currently being developed for the Type 209 and Type 212A submarine class of the German Navy. IDAS technology is based on the IRIS-T air-to-air missile which primarily targets aerial threats, such as ASW helicopters, but also against small or medium-sized surface vessels or coastal land targets. It is currently being developed by Diehl Defence and HDW, which is a part of Thyssenkrupp Marine Systems (TKMS), to be fired from Type 212's torpedo tubes. IDAS will be fibre-optic guided and officially has a range of approx. 40 km. Four missiles will fit in one torpedo tube, stored in a magazine. First deliveries of IDAS for the German Navy and operational service were planned from 2014 on.