Hollow Deep Dive System Guide

The Hollow Deep Dive System is the Rogue-like gameplay aspect of Zenless Zone Zero (ZZZ). See the Hollow Exploration explained, all the hollow event tiles, and information on the hollows here!

Hollow Deep Dive System Explained

What is the Hollow Deep Dive System

The Hollow Deep Dive (HDD) System is a feature that proxies use to tread inside the Hollow. In the system, you can synchronise with your Bangboo assistant, Eous.

You need to use Eous to explore Hollows which takes the form of a Hollow Visualization TV Wall or Board. As the name suggests, it is a form of a board made up of TVs.

All HDD System Features

Hollow Deep Dive System Visual Elements

• Part 1: Main Stage Objectives
• Part 2: More Instructions in the Pop-Up Messages
• Part 3: Tread through the TV Wall
• Part 4: Avoid Hollow Pressure
• Part 5: Corruption Buffs Enemies
• Part 6.1: Collect Observation Data
• Part 6.2: Collect Items in the Hollows
• Part 7: Use Bangboo Pug-Ins
• Part 8: Get and Use Resonium

Follow the Objectives

On the HDD System Screen, the upper left corner is where the objectives are. This is where the stage's main objectives are. These are also shown in the menu before entering the stage.

How Pop-Up Messages Work

As you progress through the stage, messages on the upper right corner will flash for a few moments to instruct you on what to do or perhaps have dialogues just included within the story whenever you trigger anything in the stage.

Traversing the TV Wall

The light grey image of the bangboo is Eous. It's the bangboo you're consciousness has been synced to. It seems you can move Eous to navigate through the TV wallboard!

Avoid Increasing Hollow Pressure

Pressure is the meter in which you gain corruption inside the Hollow. In the middle above the characters. The more pressure you gain the more likely you'll get corrupted.

Checking the Hollow Ether Activity on the HDD commission screen will determine whether the accumulation of corruption will be fast or not.

When the meter on pointed on the lower left side, it has low activity. If it's in the middle, it's a medium Ether activity. If the meter is on the lower right side, there's a high ether activity.

How to Lessen Pressure

To lessen pressure, you must get to a safety zone to reduce your pressure. Take note that once out, taking actions such as engaging in battle and obtaining inventory materials will slightly increase your pressure.

It's better to keep an eye on the meter and plan out your route to avoid being corrupted!

Hollow Corruption Debuffs

Once the pressure reaches 100, the squad members will gain one random corruption and the pressure will reset to zero. Corruptions seems to be debuffs for your allies which would make the stage harder.

There are five slots for corruption once that is filled up when you accumulate the pressure inside the hollow, the squad's HP will drain this time. Once all HP from the team has been drained, the mission will be terminated.

Collect Observation Data in Hollows

Observation Data is something you can collect inside the HDD stage. It acts as a symbol of accomplishment so you can gain more rewards. Each stage has three of them and if you get three in each stage, that will raise the rating of the commission!

Collect Inventory Items

There are many things you can collect as an inventory item within the hollow stage. You can collect Gear Coins to use to open certain pathways. You can collect Dennies which is the common currency used in almost everything within the game.

You can also get Gold Resource Crates that are like Treasure Chests.

Use Bangboo Plug-Ins

Off on the lower left side of the screen, is the bangboo plug-in. These are usable gadgets within the hollow stage. You can tap it to check its effects or you can hold it and use it instantly.

Use Resonia for Buffs

Resonia are Etheric Matter that can only be found within the hollow stage. Resonium or Resonia can buff your squad to gain an edge in exploration or combat!

All Zenless Zone Zero Hollow Events

All Hollow Terrain

Event Tiles	Effect/Meaning
Safe Path	A safe path in the Hollow... for now.
Unstable Path	An area that cannot be traversed quickly and must be crossed step-by-step.
Uncharted Path	An uncharted area that increases your Agents' Pressure.
Obstacle Wall	An obstacle that blocks the path.
Commission Objective	The location of your commission objective.
Deeper Hollow Level	Venture deeper into the Hollow. Be prepared for combat.
Ghostly Bangboo	A secret is only as valuable as the price it takes to get it.

All Hollow Mechanisms

Event Tiles	Effect/Meaning
Gear Coin Closed Gate	A closed gate that will only unlock after you pay enough Gear Coins.
Mechanism Closed Gate	A closed gate that will only unlock after you activate a certain mechanism.
Trigger Switch	A trigger switch that activates mechanisms or facilities.
Reset Button	A button that resets all mechanisms in a specific area.
Eject Mechanism	This mechanism ejects you in its designed direction.
Conveyor Belt	This conveyor belt allows you to swiftly move to its end.
Weighted Button	A button that only works while held down.
Pushed Obstacle	An obstacle that can be pushed, but may become a dead end when it encounters a wall or corner.
Obstacle with Wheels	An obstacle with wheels. When it encounters a wall or corner, it will swap its position with the pusher.
Bombs	A bomb for clearing obstacles.
Train	A train that speeds by.
Route Information	Collect route information.

All Hollow Resources

Event Tiles	Effect/Meaning
Resource Crates	A container that holds the most advanced materials for Agent enhancement.
Observation Data	Collect Hollow observation data.
Gear Coins	Grants you a large amount of Gear Coins.
Dennies	Obtain Dennies.
Shop	Trade Gear Coins with merchants.
Resonium	Grants you a Resonium.
Pressure Reducer	Reduces your Pressure.
Recover HP	Recover HP.

All Hollow Threats

Event Tiles	Effect/Meaning
To Be Continued Enemy	Defeat the enemy to venture deeper into the Hollow.
Final Enemy	Battle against the final enemy.
Normal Enemies	Battle against a normal enemy.
Elite Enemies	Battle against a tough enemy.
Strongest Enemies	Battle against the most formidable enemy in the Hollow.
Wandering Low Threat Level	Wandering enemies with a low threat level.
Patrolling Formidable Enemies	Wandering enemies with a high threat level.
Wandering High Threat Level	The most formidable foe within the Hollow, patrolling its territory.
Contamination	Reduces your HP.
Increases Pressure	Increases your Pressure.

All Hollow Visitors

Event Tiles	Effect/Meaning
Friendly Units	Friendly units. They go where you go, following your lead.
Golden Bangboo	When defeated, this Golden Bangboo drops a huge amount of Gear Coins.
Hollow Raiders	These Hollow Raiders are your peers and competitors.

What are Hollows?

An Apocalyptic Level Disaster

Hollows are apocalyptic-level disasters that plague the world of Zenless Zone Zero. These disasters are in the form of abnormal spherical dimensions and will everything they touch.

Entering a hollow is extremely dangerous as one could likely get corrupted and mutate to become an Etherial. Etherials will attack anything that's not like their kind.

Profit From Materials in Hollows

There are mysterious materials like Ether within the hollows that companies like the Belobog Heavy Industries want. That is also why Proxies and Agents venture inside it!

Belobog Heavy Industries Faction Guide

Depicted as TV Tiles in the HDD System

The pathways in the hollows are shown as TV Tiles within the Hollow Deep Dive System to lessen the effects of the corruption. There, proxies must move their bangboo to help navigate the area to accomplish goals and defeat enemies with the agents!

Zenless Zone Zero Related Guides

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Zenless Zone Zero Tips and Tricks

Gameplay Tips
Basic Combat Guide	How to Daze and Stun
Chain Attack Guide	Ultimate and Decibel Rating
Perfect Dodge and Counter	Perfect Assists and Parries
Hollow Deep Dive Explained	Attribute Anomaly