To reach this challenge you must first collect instructions by talking to Slone using a payphone, warn any three characters of impending doom, place warning signs and shut down power for two radar dishes.
Completing this challenge will reward you with 30k XP, which will help you collect those last Battle Stars for the Season 7 Battle Pass and unlock the last legendary quest of the season - confront the mole.
Note this particular challenge is no longer able to be completed.
What’s new? Chapter 3 Season 3 has arrived! New additions include Reality Seeds and Saplings and riding animals, along with the new Battle Pass, characters collection and map changes.
It’s a good idea to know how to get XP fast in Fortnite.
For this reason, you need to ensure you land on the reminder of the IO base, which is beneath the western grey barn. Don’t worry if you miss the landing - you can easily gather enough materials in the surrounding area to build a set of stairs up to this ledge.
Once you’re safely on the ledge, you’ll find the countermeasure attached to part of the wall. Now all you have to do is interact with it to complete the challenge!
If you’d like to learn more about Fortnite Season 7 before it ends, check out our guides on the Battle Pass, legendary quests, alien artefacts, cosmic chests and IO weapons.