This challenge is part of Fortnite Chapter 2 Season 1 Dive! Mission during which you'll have to use the Harpoon Gun in three different ways: pulling an item, an opposent and fishing a fish.
No particular difficulty then! All you need to do is get your hands on a copy of the game's brand new weapon, which only exists in rare quality.
The Harpoon Gun can have the same use as the Fishing Rod with one advantage: it's much faster. It will allow you to bring back to you items (weapons or utility) and stacks of resources.
You can also aim at a school of fish to harpoon a Fish or a Slurp Fish.
We recommend completing this challenge in Team Rumble mode, as it will help you avoid eager opponents early in the game.