The Sinister Strip is one of several POIs available on the map in Fortnite Chapter 7 Season 3, and you will find a Locked Prison Cell in one of the buildings. The building in discussion is opposite the gigantic Sprite structure. Once you head inside, take the stairs that go down from the first floor, and you’ll come across the cell.
Thankfully, you can open it to get some valuable items.
How to Open the Locked Prison Cell in Fortnite
If you stand in front of the locked door, you’ll notice that there are two big red wires.
One of the wires goes to the left, and the other goes to the right. Follow the wire that goes left. Drop, and keep following the wire through the sewers.
You’ll come across a point where the sewer will diverge into multiple paths. Your objective is simple: follow the wire. You will eventually come across a vent to open. Go through the opening, and you’ll reach a grid to deactivate.
Return to the locked door, and now follow the wire that goes to the right. Keep following the wire and go past the gnome in the sewer. You’ll eventually reach another vent to open and access another grid. Deactivate it and then return to the prison cell.
You’ll now notice that the cell door can be opened because you have powered both fuses up. Head inside, and you’ll find two Rare Chests, two Regular Chests, and a random Sprite.
The Rare Chest has an increased chance to spawn a Vault key. There are eight vaults located all over the island. However, there’s always a chance to find the Limitless Seven Silders. It allows you to slide infinitely, and it feels absolutely broken to use. You can easily get out of tight situations and slow yourself down to aim and shoot at enemies.
However, be careful about the location. You can also find John Wick’s dog nearby, whom you can rescue to get more loot. I have always found many players dropping at this location. Hence, only try to solve the puzzle and unlock the prison door after the coast is clear.
