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2. Greater Underwater Propulsion Power Program - Wikipedia

   en.wikipedia.org/wiki/Greater_Underwater...

   That analysis led [1] to four goals—increasing the submarines' battery capacity, streamlining the boats' structures, adding snorkels, and improving fire control systems. The navy immediately focused on designing a new class of submarine, but the Bureau of Ships believed the fleet of existing Gato , Balao , and Tench -class submarines could be ...

3. Type XXI submarine - Wikipedia

   en.wikipedia.org/wiki/Type_XXI_submarine

   Armour. Bridge: 17mm. Type XXI submarines were a class of German diesel–electric Elektroboot (German: "electric boat") submarines designed during the Second World War. One hundred and eighteen were completed, with four being combat-ready. During the war only two were put into active service and went on patrols, but these were not used in combat.

4. Electric boat - Wikipedia

   en.wikipedia.org/wiki/Electric_boat

   An electric boat is a powered watercraft driven by electric motors, which are powered by either on-board battery packs, solar panels or generators. [ 1] While a significant majority of water vessels are powered by diesel engines, with sail power and gasoline engines also popular, boats powered by electricity have been used for over 120 years.

5. Polestar to provide batteries, chargers for electric ...

   www.aol.com/news/polestar-batteries-chargers...

   The world of Uber-expensive electric boats is an interesting place, and Polestar's tech is about to go aboard hydrofoil boats from Swedish company Candela. Polestar to provide batteries, chargers ...

6. Gato-class submarine - Wikipedia

   en.wikipedia.org/wiki/Gato-class_submarine

   1 × 3-inch (76 mm) / 50 caliber deck gun [4] Bofors 40 mm and Oerlikon 20 mm cannon. The Gato class of submarines were built for the United States Navy and launched in 1941–1943. Named after the lead ship of the class, USS Gato, they were the first mass-production U.S. submarine class of World War II.

7. U-boat - Wikipedia

   en.wikipedia.org/wiki/U-boat

   U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. The term is an anglicized version of the German word U-Boot [ˈuːboːt] ⓘ, a shortening of Unterseeboot (under-sea boat), though the German term refers to any submarine. Austro-Hungarian Navy submarines were also known as U-boats.