The drop in the water level revealed the Siona spacecraft in Fortnite. You can find him just east on Craggy Cliffs, on a sandbar in the sea. You can also help the pilot by researching three parts of his ship, preparing it for him, and sending him on his way.
You can see the three locations shown on the map below.
Spaceship part 1
The first part is the Beacon, and it's still on the cliff in front of the ship. Just build a ramp to get it.
Spaceship part 2
The second part is the drums. This can be found under a rock, right next to the ship. You just have to break the rock to get there. When you are near, it will make a low hum.
Spaceship part 3
The last part is the heat sink. You can find it next to a rock on the small peninsula right in front of the spaceship.
When you get one of the parts, just take it back to the ship and set it up. When you have them all, interact with the ship and it will start its engines. A green dome will appear and a countdown will begin. All you have to do is survive until the end of the countdown and the ship will take off, completing the challenge.
You'll have to watch out for other players, but we found two friendly players who were just happy to focus on finding the coins with us, so you might just get lucky.
