After Stan, Dipper, Wendy, and Mabel, got captured by the Marines. Lock in Chains. Given Pick axes to mine the Rainbow diamond. There are other prisoner too. Mostly Pirates and slave from other nations. And the Marines have them work at gunpoint.
Stan: who are we even mining it for.
Kendal: the World Nobles want an mighty flow of cash in their cozy lifestyles.
Mabel: who?.
Prisoner: you don't know. There heartless monsters who treats the common flow like mud. Just because their born of godly blood.
Prisoner 2: they do whatever they want and enjoy the life of godhood. While we live in fear and resentment.
Mabel: that awful.
Stan: yeah. But how do you become one of these world noble guys. They must be living the high life.
Kendal: shut it. You born of unholy blood can't become a World noble. Even if you became insanely rich. You can't. It something to be born with. Now Get Back to work.
Dipper: great I,m spending the rest of my life mining for some Stupid Noble guys.
The marines point their guns at Dipper. Forcing him to be quiet.
Kendal: in the name of absolute justice I will not let you insult the names of the World noble. You young brat.
Then a marine Came to Commander Kendal and Said that the Strawhats are Coming to the island.
The thousand sunny is charging straight ahead. With Candy on the crows nest.
Candy: Marines on the port valve.
Luffy: Right. fire the Gao cannon Usopp.
The Thousand sunny is charging up. Then the gao cannon fired sinking 3 marine ships.
and during the confusion. Dipper and the others are trying to escape. Dipper try to break the chains but his arms are to weak.
Dipper: there's got to be a way to escape from here.
Stan: leave it to me.
Stan grab a bobby pin from under his hat and pick the locks freeing them
Mabel: that's amazing. How do you do that.
Stan: if you been arrested as many times as I have. You learn to pick a few tricks.
Then the other prisoner Beg for their help.
Mabel: Grunkle Stan. We gotta help them.
Stan: fine I'll pick the locks of their chains. Dipper, Wendy stand watch.
As Dipper and Wendy stand watch they started talking a bit.
Wendy: you know despite being force to slave labor this summer is getting to get good.
Dipper: yeah but we've have to find that Bill cipher piece.
Then one of the freed prisoners. Walk to Dipper and said.
Prisoner: wait you said Something about a bill cipher piece.
Dipper: yeah. wait you know where it is.
Prisoner: yes in a cave in tunnel at the center of the island I saw something that look likes a strange yellow triangle puzzle piece.
Dipper: we've found our leaded .
Then Stan, Dipper, and the girls. Ran to the center of the island.