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YouTubeElement 18
Submarines – Extreme Technology – Big Bigger Biggest
At 171 metres long, the USS Pennsylvania is the biggest submarine in the US Navy. It can dive deeper than a thousand feet, sail for 20 years without refuelling, and remain submerged for up to 6 months. The vessel carries a crew of 155 men and a deadly nuclear arsenal. The film investigates how this submarine was made possible through a series ...
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19K views · 491 reactions | This imposing concrete structure in the German city of Bremen is 1400 feet long, 300 feet wide, and 90 feet high, and looks every inch the secret Nazi facility that it is. Its purpose was to build and test U-Boats. WWII By Drone | Smithsonian Channel Aviation Nation | Facebook
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19K views · 491 reactions | This imposing concrete structure in the German city of Bremen is 1400 feet long, 300 feet wide, and 90 feet high, and looks every inch the secret Nazi facility that it is. Its purpose was to build and test U-Boats. WWII By Drone | Smithsonian Channel Aviation Nation | Facebook
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