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1. Leonardo da Vinci made first sketches of submarines in the late 1400s. 2. In 1890s people built the first real submarine. 3. Today countries spend billions of dollars on building submarines.
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1 First sketches of submarines were made by Leonardo da Vinci in the late 1400s.2. In 1890s the first real submarine was built by people.
3. Today billions of dollars are spent on building submarines by countries.