Lost and found is the starting mission for Just Cause 4: International Waters.
Description[]
In-game map description: "Sargento has contacted Rico with dire news about The Agency. A message intercepted by the AoC has revealed their plans to establish a colony on Islas de los Perdidos, an archipelago 150 kilometers east of mainland Solís. He has provided coordinates that lead to a small island in the group. Go there and find out what The Agency is doing."
The marker location is at Aeropuerto General Benitez, near one of the hangars.
Walkthrough[]
Sargento will call Rico:
Sargento: "Okay, so we've intercepted a message from The Agency. We can't tell who it's from or what it says, but we do know where it was sent to. This island chain, Islas de los Perdidos. We actually have a flight bringing supplies over there right now, why don't you hitch a ride?"
A cargo plane will spawn on the runway. Go to the plane and get in the cargo bay. An Army of Chaos solider welcomes Rico onboard and closes the hatch.
A cutscene plays, showing the plane taking off and flying over the island. It cuts to where the plane is almost there there, and Rico calls Sargento.
Rico: "I'm almost there."
Sargento: "Great. I'll-" The plane begins to be shot at by an Agency jet.
Rico: "Uh-oh. Looks like we've got company."
The plane starts spiraling down, and Rico opens the hatch and jumps out, as all the cargo inside the bay spills out behind him.
Sargento: "Rico! Are you okay? Those bastardos shot down the plane!"
Rico: "I'm fine, things always start out like this."
Sargento: "Damn, there were a lot of supplies on that plane. At least you're okay."
Rico: "They must have a big foothold already if they're able to scramble jets and shoot down incoming planes."
Parachute the rest of the way to the ground. A marker will appear, follow it to Próspero Submarinos.
This is the end of the mission. From here, you can explore (and continue to destroy) the Agency-controlled island, or start the first Region Strike: Submarinos Sabotage.