It appears that the "Type 2000" submarine was first proposed to the USN
during the Ford Administration when there was a degree of interest in
conventionally powered patrol subs for the mid-Atlantic ASW mission.
Nearly a decade later, the design was offered to Australia, where it
was apparently the preferred bid, losing only to a far less developed
Kockums proposal. Most recently, in 2001, the design was apparently
offered to Taiwan.
Here is a diagram:
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