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Greek divers in the siege of Syracuse submerged and removed obstacles, allowing the safe passage of their warships. This is the first time such tactics are recorded.
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A stick casts no shadow at noon on the longest day in Syene. Do sticks cast a shadow at that same time in Alexandria? Turns out, sticks do. Why? Eratosthenes deduced that this was due to the curvature of the earth and was able to calculate this to high precision. https://www.youtube.com/watch?v=G8cbIWMv0rI
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Peruvian pottery appears to show a fisherman who uses goggles.
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Magellan’s expedition circumnavigates globe for first time. (He did not survive, The Filipino’s had better aim.)
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Cook leaves England to observe Venus crossing the sun. Cook went on to be one of the greatest explores in history.
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Steamboat inventor Robert Fulton builds the first true submarine, The Nautilus. Some of the tech he used is still in use today.
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Indications of life in ocean depths of over 6000 feet are discovered, raising questions about accepted theories of survivability at those depths.
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The same person then discovers extensive life from dredgings of coastal surveys.
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1500 lives are lost in the most famous shipwreck of all time. Engineers believed they had made an unsinkable ship. Nature had other ideas.
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Jacques Cousteau, owner of possibly the greatest French name of all time, invents the Aqua-Lung, a device that regulates breathing and allows divers to stay underwater for extended periods without being tethered to the surface.
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Dr. Sylvia Earle does an underwater walk at 1250 feet for 2.5 hours.
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First video of the creepiest thing you’re likely to ever see: https://www.youtube.com/watch?v=jCWop491Q9Y
