Senator Chris Evans: The Minister for Defence has provided the following answer to the honourable senator's question: Over the period 1 July to 31 December 2011, submarines undergoing maintenance / refit programs were as follows: (i) HMAS Collins was completing a planned certification extension docking, which concluded on 18 August 2011. The submarine continued unscheduled maintenance until 21 October 2011. (ii) HMAS Farncomb commenced a planned intermediate maintenance availability on 16 November 2011, which was ongoing for the remainder of the period. (iii) HMAS Waller commenced a planned mid-cycle docking on 13 September 2011, which was ongoing for the remainder of the period. From 4 July to 13 September 2011, Waller was conducting mid cycle docking preparations. (iv) HMAS Dechaineux conducted unscheduled maintenance from 5 to 9 August 2011. (v) HMAS Sheean was conducting a planned full cycle docking throughout. (vi) HMAS Rankin was conducting a planned full cycle docking throughout.