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A Greek astronomer name Eratosthenes is the first person to find the circumference of the earth using only angles and shadows.
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Greek astronomer and geographer Ptomely creates a map of the planet (or to his time, "The Ancient World") including the longitude and latitude lines, all the continents, along with all the oceans.
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Vikings begin to colonize and explore Iceland, Newfoundland, and Greenland. They discovered these places using the north star leading them to be the first ones to do this.
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English mathematician William Bourne creates the first known plans for an underwater boat or better known as a submarine. He drew it having a leather covered wooden frame and being rowed from the inside.
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A guard in the french navy named Chevalier de beauve creates a lead shoes water proof suit. Its air is provided through 2 tubes made of leather attached to the helmet.
