"The Royal Australian Navy (RAN) is negotiating with the Australian Submarine Corporation for an integration study into equipping its Collins-class diesel electric submarines with a new heavyweight torpedo. The study would consider the implications of replacing the existing analogue Mk 48 Mod 4 heavyweight torpedoes with the all-digital Mk 48 Mod 6 Advanced Capabilities (ADCAP) and Mod 7 ADCAP weapons. An earlier tender was cancelled in July 2001 despite the shortlisting of three potential suppliers: STN Atlas offering the Seehecht DM2A4; Whitehead Alenia with the Black Shark; and the Mod 6 ADCAP. Canberra decided to proceed with the sole-source selection of the Mod 6/7 ADCAP."