Skoshi8 In reply to NSLC [2016-02-03 23:15:49 +0000 UTC]
That was known as a GUPPY conversion (Greater Underwater Propulsion Power) that was performed on US subs after WWII.
Guns and railings were removed, the conning tower, periscopes and schnorkels were enclosed in a streamlined metal and fiberglass sail, and higher capacity batteries were installed.
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