Ian McPhedran
AUSTRALIA'S troubled Collins Class submarines are more than twice as expensive to operate as US Navy nuclear submarines that are more than three times bigger.
Figures obtained by the Herald Sun, show the six Collins subs cost about $630 million a year - or $105 million each - to maintain, making them the most expensive submarines ever to put to sea.
Only two of the fleet of six could go to war at the moment.
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