Take some time building up Gau's abilities, then head to the cave in the crescent-shaped mountain to the south. Gau starts wandering around, low to the ground. Cayenne and Mash look at each other in confusion, until Mash suddenly realizes what's going on.

Mash and Cayenne cringe, but recover.

Above and a bit to the right of the entrance, Gau looks around for a bit, but comes up empty.

At one outcropping, Gau looks around for a bit, gets excited, and presents something to the others.

Gau appears shocked and shakes his head. Mash and Cayenne look a bit wearied.

In the top-left corner, Gau walks to a cliff edge, looks down, and starts waving his arms excitedly. Mash walks over to take a look.

Gau sneaks up behind him and...

Mash is startled, and the sound of something falling is heard...

In this case, Mash doesn't scream, and no money is lost.

Further into the cave, Gau unearths a peculiar-looking helmet. Mash and Cayenne are amazed.

Treasure... yesss... my preciousssss... gollum!

On the far side of the cave is a ledge overlooking the ocean current.

Gau takes a look over the edge and leaps back, frightened. Mash and Cayenne laugh briefly at this.

Mash and Cayenne jump in. Gau hesitates, but follows. As they heard earlier, the helmet lets them breathe underwater, and the current heads straight for Nikaea.

Let's ignore the fact that they shouldn't all be able to use the helmet at once, and also that they shouldn't be able to fight normally underwater.

There are two forks along the way. Each time, going left means more monsters, while going right leads to a small underwater cave. These caves contain an X-Potion and another Green Beret. After the trip is over, the party washes up in a harbor.

As you might expect of a port town, there's a large dock, and the city is dominated by stores full of goods and merchants trying to sell them.

The following scene (in the bar) doesn't really matter much, but it's just too funny to leave out.

The ぇ above is actually a halfwidth hiragana え (e) in-game, but close enough. Few character sets have halfwidth hiragana, or I'd use an actual halfwidth え.

She's singling out Cayenne. This seems to be about the last thing he expected...

タニマ (谷間, tanima), literally refers to a valley or chasm... there's only one thing she could be referring to. And in case it's not obvious, this dialog goes... somewhat differently, to say the least... in the NA version.

The dancer drags Cayenne halfway across the room before he can react. When he does, he overreacts, rushing the other way so quickly he slams into the wall. Mash and Gau, who previously just watched, now look rather worried. The dancer approaches Cayenne again.

Mash decides to step in, and goes over to talk to Cayenne.

Mash's uncharacteristic use of -san here suggests a teasing tone.

Mash laughs a bit at this. The dancer walks closer.

That ぇ is another halfwidth え... they look weird.

ウンチク (蘊蓄, unchiku) refers to a person's vast knowledge and experience. Here, it shows that he's lecturing her, without boring the player with the details.

Mash starts laughing, and the woman appears to be paying no attention. Oh well.

An old woman in the bar shares another interesting bit of information.

After finishing any shopping, Mash, Cayenne, and Gau head back to the harbor and take a ship to South Figaro.

The expression 目と鼻の先 (me to hana no saki) means that something is very close.

The music fades out. Cut back to the black room, with the remaining scenarios, unless all are complete.