It's made from green turban shells, which are often used to craft ornaments.

It's a shell primarily made up of calcium carbonate... so I don't think a metal detector will find it...

No way. The guy never said a thing about that.

Looks like he didn't know, either—

What a troublesome couple.

So our efforts were for nothing...?

Captain and I dived so many times.

That's right! So let's give 'em this one, say we found it, and be done with it!

Let's go back already.

Good job, Mi-kun.

I'm seriously worn out...

*slump*

Mickey, you can ride behind us.