1. Conquest of Alligator Island is a prerequisite quest. You start out in Heine, and and go to the weapons and armor shop, talk to Trader Espen

2. Show him the map and go through the dialogue.

3. He will then present you with a choice, if you select that you want to sell the map, you will recieve 1000 adena and it will be over. If you tell him that you do not want to sell the map, he will go on in the dialogue which will lead you to a desciphered treasure map.

4. You will now get the quest and by using the quest locator it will show you where the sunken treasure is (same spot every time). IMPORTANT: Before you leave, make sure you have a Key of Thief on you, which is required to open the chest.

5. Go to the location, swim down to the coral reef, there will be 3 Great Sharks right on the chest and they are agressive.

6. Open Chest, inside you will find a random assortment of items, usually adena + 1-2 items

Possible chest content includes:

500/800/1000/1300 or 1600 adena
1-2 Blue Onyx (value 500 adena each)
Mechanical Golem Spare Part (value 2.500 adena)
Emerald Stone (value 10.000 adena)
Feriotic Porcelain Urn (value 10.000 adena)
Theme of Battle
Theme of Celebration
Theme of Comedy
Theme of Love
Dye of High Degree (+1/-3) (value 6.500 adena)
Dye of High Degree (+2/-3)
Scroll of Enchant Armor: D-grade
Scroll of Enchant Armor: C-grade
Sage's Worn Gloves
Elven Mithril Gloves