In the Genshin Impact summer world called Simulanka, you'll meet Panuelle, a toy figure who is missing his friend, Chauvigne, who turns out to be a potted plant. Talking to Panuelle will trigger a Hidden Exploration Objective that involves retrieving Chauvigne from a cave.
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Panuelle's Hidden Exploration Objective is only unlocked after you complete the first three Summertide Scales and Tales missions:
After completing the above requirements, head to the islet west of the Broken Sea (circled above) and speak to Panuelle to activate the Hidden Exploration Objective. Panuelle will ask you to find Chauvigne in the "cavern below this island."
After talking to Panuelle, go to the southern part of the island, where you will find a red slide that leads to a ladder that will take you further down. Go down the ladder to immediately see the entrance to the cave. Inside, you will find a flower that blows a wind current, preventing you from entering.
