In what decade was the submarine named "San Juan" built?
ARA San Juan (S-42) ARA "San Juan" (S-42) is a TR-1700-class diesel-electric submarine in active service with the Argentine Navy.
T-1-class submarine The "T-1"-class submarines were a pair of submarines built for the United States Navy in the early 1950s for use in training submarine personnel and testing submarine equipment. Both submarines of the class served in these roles for over 19 years.