from nationaldaycalendar
Welcome to April 11th on the National Day Calendar. We think of the submarine as a fairly modern invention, and with good reason. The technology involved in keeping a ship underwater while providing humans with air is pretty complicated. However, the first working model of a submarine was actually created in England in 1620. Cornelis Drebbel, a Dutch engineer, built what he called a “diving boat,†a wooden vessel that could travel underwater. It used greased leather to keep air in and was propelled by oars. He showed off this invention in London and traveled along the Thames River at a depth of 15 feet. The trip only lasted about 9 miles, but considering the technology, it was wildly impressive. On National Submarine Day, we celebrate an invention that still seems amazing! I’m Marlo Anderson with the National Day Calendar. See you again tomorrow as we Celebrate Every Day! http://nationaldaycalendar.com/national-submarine-day-april-11/
3 years ago
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