P-S. Oh, hey, Smarty Pants, trusty narrator here. Glad you could meet me 10,000 feet below the ocean service.

Oh, did you not realize you were over two miles deep in the ocean? Well, you are. In fact, thanks to the magic of podcasting,

we're all crammed inside the Deep Sea Challenger, which is a high-tech underwater vehicle known as a submersible.

Um, Professor, you might want to take a hard left and dodge that giant squid!

Oh, good call, trusty narrator.

Smarty Pants, please say hi to Professor Briney. She's an engineer who knows all about underwater vehicles like this one.

She's my partner today as we ride the deep-seat challenger to the bottom of the Mariana Trench, the deepest part of the Pacific Ocean.

Hi there, Smarty Pants.

Thanks for joining us as we make our way 35,787 feet down into the ocean.

That's almost seven miles.

Whoa.

It'll take us about two and a half hours to get all the way down to the bottom.

Yep, and wouldn't you know it? I forgot to bring a book.

So, Smarty Pants, I figured I'd pass the time by telling you all about the underwater vehicle that made this super high-tech submersible possible, the submarine.

And I'm happy to help too. After all, the submarine was a pretty tricky invention for humans to figure out.

But now, ever since they did, they'd sure come in handy.

From exploring the ocean's depths, to helping recover lost items from shipwrecks,

to their role in combat missions.

They can even launch nuclear weapons. I mean, but of course, hopefully they never will.

Good points, Professor, and despite it being incredibly cramped in here, this is the perfect place to take a deep dive on submarines and learn things like, how do they make themselves sink?

How long can they stay underwater?

And how does the submarines crew get fresh air to breathe?

...