Aquaman Challenge - Use a Whirlpool at the Fortilla
For Week 1 of the Aquaman Challenges in Fortnite (Chapter 2 / Season 3) you need to "Use a Whirlpool at the Fortilla".
You can find the Fortilla on the left hand side of the map, there will be a whirlpool in this POI.
Simply go into this to complete the challenge.