The Collins class submarines HMA Ships DECHAINEUX, (CMDR S. P. Davies, RAN), and SHEEAN, (CMDR W. H. Wiltshire, RAN), were commissioned in a joint ceremony in Adelaide. Both submarines were laid down in the Australian Submarine Corporation Yard in Adelaide. DECHAINEUX was launched on 12 March 1998. SHEEAN was launched on 1 May 1999, with Mrs Ivy Hayes, (Sister of OS Terry Sheean), performing the launching ceremony.