Further to this; was watching a docu on Discovery Channel earlier which showed HMS Swiftsure the modern SSN. She looked in a pretty rough condition, missing acustic tiles, patches of rust and what looked like green algae growing on her bows. Plus the usual encrustations of salt etc. So even in peacetime subs can look pretty scruffy. I was surprised how poor her condition was, I presume she was due for a refit not long after the program was made.
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