The EPF now has to protect the Island Codex from Herbert. We have a guide on how to do so with a video (courtesy of MysteriousAeon) as well as a step-by-step walkthrough!
Listen to Aunt Arctic’s orders then collect the Island Codex and head to the Migrator to speak to Rockhopper.
Speak to Rockhopper by tapping the orange interactive button and listen to him. Then head to buoy 6, which is next to the Lighthouse.
Equip your jackhammer from “My Inventory” and dig on the red X. Unfortunately you’ll find cursed treasure! Dig on the treasure chest again and now head to buoy 2 in Coconut Cove. It’s opposite the Lifeguard Station.
Dig on the red X on the island with buoy 2 on it. You’ll discover, well, Stinky Cheese! Bury up the cheese again by drilling on it.
Go to the red X by the entrance to the Sea Caves. Drill there again using your Jackhammer and a hole will appear. Cover up the Codex by drilling on it.
Report back to Aunt Arctic at the Exchange in Boardwalk. Then claim your reward! I hope this guide helped!