Assassin's Creed Black Flag: Ambergris Key 100% Completion Guide

By maturemindedgamers | Jul 24, 2026

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Join Jim from Mature-Minded Gamers as we explore the beautiful and dangerous Ambergris Key in Assassin's Creed IV: Black Flag Resynced. Located in the southwest corner of the map, this hidden location features a complex underwater tunnel system filled with stinging jellyfish and precious loot. In this video, we navigate the treacherous waters, survive a near-fatal drowning experience, and fight our way through a pirate-infested cave to claim the ultimate prize: a secret treasure map. Whether you are looking for 100% completion or just some extra gold, this walkthrough has everything you need to find every secret in Ambergris Caye.

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0:00 - Locating Ambergris Key on the Map

0:33 - Diving Underwater & Avoiding Jellyfish

1:17 - Finding the First Sunken Chest

2:01 - Near Drowning & Finding Air

2:45 - Collecting the Message in a Bottle

4:21 - Infiltrating the Secret Pirate Cave