James Goldrick’s recent post for The Strategist shows that many classes of submarine remain in service for a period of 30–40 years. By this calculation alone, the Collins Class won’t need to retire until the mid-2030s, especially if they were to undergo a life-of-type extension program. However, the real measure of the longevity of a submarine isn’t its age in years but rather the number of deep dives it has performed.
http://www.aspistrategist.org.au/diving-deeper-into-sea-1000-life-spans-and-design-choices/
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