One of the most significant developments in the history of naval warfare was the submarine.

The submarines offered a means of stealth and surprise that surface ships couldn't compete with.

At first, navigating submarines was relatively simple.

They just traveled below the surface and used a snorkel in a periscope to see their way.

However, as submarines improved, they could dive deeper and they encountered a problem.

How could they see and navigate?

The answer came from nature.

Learn more about sonar, how it was developed, and how it works, on this episode of Everything Everywhere Daily.

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This episode is sponsored by Planet Money. Tariffs, mean coins, girls scout cookies. What are they all

have in common? Money. Economics is everywhere and everything fueling our lives, even when we least expect it.

If you're a fan of everything everywhere daily and are curious to learn something new and

exciting about economics every week, I recommend you listen to the Planet Money podcast from

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