5 Hours Of U-Boat & Sea Warfare Facts To Fall Asleep To
Sea Power is a history of naval vessels through to modern day -- an extraordinary view from above the water and below. Discover how Liberty Ships were constructed, the development of aircraft carriers and how the invention of sonar affected submarine warfare. Subscribe to Spark for more amazing science, tech & engineering videos: https://goo.gl/LIrlur 🚀 Join the Spark Channel Membership to get access to perks:    / @sparkdocs  Sign up to History Hit to start watching now https://bit.ly/45CPh5u Find us on: Facebook:   / sparkdocs  Instagram:   / spark_channel  Any queries, please contact us at: [email protected] #Spark
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