Senator Johnston asked the Minister representing the Minister for Defence, upon notice, on 21 March 2011: (1) For the period 1 July to 31 December 2010: (a) which submarines in the Royal Australian Navy fleet were non-operational; and (b) for each submarine that was non-operational, what was the reason for its non-operational status. (2) What was the cost of maintaining the six submarines for the periods: (a) 1 July to 31 December 2010; and (b) 1 January to 31 December 2010. (3) What was the total cost of operating and sustaining the six submarines for the periods: (a) 1 July to 31 December 2010; and (b) 1 January to 31 December 2010. (4) What were the crewing complements for each of the six submarines for each month in the periods:(a) 1 July to 31 December 2010; and (b) 1 January to 31 December 2010.