If his lung capacity is that great, it's possible he could swim out through the maze of underground corridors leading down here.

Shall we do some swimming ourselves?

Today we're gonna teach you how to swim. I'm Ichijou, and...

Well, don't overwork yourself. All you need to do is somehow finish the race.

Oh, right. We should swim first.

Come on, let's go swim.

Come on, time to go swimming! Let's race!

Come on, let's get in! We're going to race!

Come on, let's find a place to put our stuff and get swimming!

Then why don't we swim out there?

Teach me how to swim some more next time.

...and they started swimming together.

It reminds me of when I was swimming around in the arctic ocean.

Swimming race!

You should probably learn how to swim all over again.

Hazama-san, don't just read all day! Swim!

I'm a terrible swimmer, and this suit leaves nothing to the imagination.

I want to swim with the penguins, too.

Yeah, yeah. Let's go swimming together over there.

Sakura-chan is a good swimmer after all.