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Originally Posted by MarkShot
The early subs were initially intended for Harbor defense.
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As were torpedoes. They were origionaly conceved as having batteries of torpedo tubes installed in costal fortications that could fire on attacking ships.
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Early designs lacked periscopes and navigated by porposing (periodically breaching) to correct bearing. Early periscopes were fixed structures which did not even rotate.
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Not only that but the image shown was upside down.