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The first submarine that worked was invented by Cornelius Jacobszoon Drebbel. This began the thought that it was actually possible to make an underwater vesse and is the beginning of what subs are today.
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The first electrically powered submarined was invented by Andrew Campbell and James Ash.
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The first snorkel was used in a submarine. The snorkel allows submarines to take in air even when submerged.
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Japanese planes bomb America's naval base at Pearl Habor doing much damge to boats and to a lesser extent submarines.
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In the Battle of Midway subs played a major role in the battle. the USS Natilus leads a squadron to an aircraft carrier and sunk it, which was a very vital part of the battle.
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The USS Indianapolis is sunk by a Japan submarine.
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The first ever nuclear powered submarine was made and it was called the USN "Nautilus". This revolutionized submarine warfare, because now submarines could stay under water as long as they wanted. This is what made submarines what they are today.