★ Interactive Map and Locations
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The Ocean Floor is a new explorable region in Dragon Quest 2 HD-2D Remake (DQ2), and you’ll need to learn how to dive before you can reach it. Learn how to dive to the ocean floor, when it unlocks, and check out every location you can visit underwater!
List of Contents

You can only dive in parts of the ocean marked in dark blue on the world map. Sail to any dark blue area and hold down the descend button to dive and the ascend button to return to the surface.

Once you’re underwater, you’ll notice deeper zones marked by even darker blue sections on the seafloor map. These areas let you dive further down using the same controls as regular diving.
While exploring the ocean floor, you can freely move upward or downward. This lets you pass over rocky terrain and reach otherwise blocked paths.
These controls also matter when collecting deep sea Sparkly Spots, so keep them in mind as you explore.
The ship can be received as a reward for helping a NPC in trouble with a monster in Rippleport. After helping them with the monster, talk to the old man by the port to receive your ship.
How to Unlock and Get the Ship

You unlock diving by obtaining Lorelei's Harp while traveling from Mersea to the Mermaid Sanctuary during the story.
Once you receive it, your ship gains the ability to dive automatically, just continue progressing naturally to reach this point.
How to Get Lorelei's Harp and Effects
The Deep Sea Map is an even lower layer beneath the regular ocean floor. You can only reach it after fixing Lorelei's Harp.
Talk to the Mermaid Queen in Mersea after obtaining both the Pearl Earring and the Letter in a Bottle to upgrade the harp and access the deeper region of the ocean floor.

The Mermaid Sanctuary, Mersea, and the Sunken Ship are all mandatory locations tied to the main story, so you won’t miss them. Completing everything here rewards you with the Magic Key.
Walkthrough Part 8: Mersea to Mermaid's Sanctuary

The Den of Iniquity is another main story location, unlocked after you get the Magic Key. This is where you’ll find Mariella, the boss ruling over the Ocean Floor.
The Ghost Ship drifts constantly underwater and won’t appear on the world map. However, when you get close enough, a small icon will show on the minimap in the top-right corner of your screen.
The Ghost Ship also holds one of the 7 Living Memories as a treasure.
List of All 7 Living Memory Locations

You can obtain the Eye of Rubiss in the Rubiss Shrine, which becomes accessible once you upgrade Lorelei’s Harp and unlock deeper diving. The Eye of Rubiss is required to enter the Hall of Hargon.

There are three Sea Lord Lairs you can explore once deep diving is unlocked. Both the Northern and Southern Sea Lord Lairs contain Living Memories, but each one is blocked by very strong boss fights you’ll need to overcome.

Seabed Storerooms are optional locations you can explore after unlocking deep dive. All three storerooms contain multiple treasures, including useful items and equipment that can help you during the late game.

Tips and Tricks: Beginner's Guide to DQ2
Ocean Floor Guide: How to Dive Underwater?



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