Hole Is Mine Depth Guide: All 40 Depths & Dangers Listed

The hole is mine depth guide you are about to read breaks down every one of the 40~ depths in this incremental adventure, from the first few meters of dirt to the mysterious bottom that the community is still mapping out. Knowing what waits below is the difference between a smooth descent and losing your best Mini'Ohs to a hazard you never saw coming, so this hole is mine depth guide exists to give you that edge before you even drill the first hole. We will cover the full depth list, the dangers that appear at specific ranges, how to go deeper efficiently, and what the endgame Infinite Hole mode actually asks of you.

Understanding the Hole Is Mine Depth System

The core loop of Hole Is Mine revolves around sending your Mini'Ohs down the divine Hole to extract impurities while you manage their safety and efficiency from the surface. According to the official Hole Is Mine page on SpaceJazz Games, the game features roughly 40 depths with dangers and secrets scattered throughout, which means the depth system is not just a vertical number counter but a layered progression wall that gates your access to better resources and equipment.

Each depth tier introduces new impurities to extract, new hazards to avoid, and new secrets that reward careful exploration. The game's incremental nature means you will revisit earlier depths many times while upgrading your Mini'Ohs, so understanding the full hole is mine depth list helps you plan which upgrades matter most before you commit resources.

The depth system fundamentally asks you to track three cumulative variables with every shovel swing: your current depth in meters, your oxygen tank percentage, and your fuel reserves, since each of the five distinct cave layers (from the sandy Surface Zone down to the Bedrock Depths) imposes a steeper oxygen drain rate and introduces new hazards like crumbling stone and pressure fissures. To progress past the 50-meter mark, you must prioritize upgrading your pickaxe to Tier 3, as the base tool's swing speed drops by 40% on hardened rock, and plan your descent so that you always have enough fuel to return to the surface—a miscalculation here forces a costly rescue that resets your depth progress.

• Purify the Hole by extracting impurities at each depth, which generates the resources needed to grow your Village.

• Manage Mini'Ohs as autonomous miners that need equipment and upgrades to survive deeper environments.

• Use Shelly as your personal drilling tool to break through harder layers and push the depth boundary further.

• Discover secrets hidden at various depths that provide permanent bonuses or rare equipment.

The depth progression is designed to feel rewarding at every stage, but the difficulty curve steepens noticeably once you pass the halfway point. Community reports from the playtest phase indicate that the first few depths are intentionally forgiving to teach you the mechanics, while the later half demands optimized builds and careful hazard management.

The Complete Hole Is Mine Depth List and What Each Zone Contains

To make this hole is mine depth guide genuinely useful, we have compiled the known depth ranges and their notable characteristics based on the official game description and community testing data. The exact number of depths can shift slightly between versions, but the launch build targets approximately 40 depths across multiple distinct zones.

The Upper Crust depths serve as your tutorial space where you learn the rhythm of sending Mini'Ohs down and retrieving them before hazards deplete their health. Most players complete this range within the first hour, and the resources gathered here fund your initial Village expansion.

Moving into the Mineral Belt changes the equation because heat vents can damage Mini'Ohs that linger too long near certain walls. This is where the equipment system starts to matter, since thermal resistance becomes a real consideration rather than a nice bonus. The Abyssal Reach introduces toxic gas clouds that spread across the mining area, forcing you to time your extractions carefully or equip gas filtration modules.

The Divine Core represents the final stretch of the standard depth list, and community reports suggest the hazards here combine everything you learned earlier while adding new purification anomalies that can corrupt your Mini'Ohs if left unchecked. Reaching depth 40 is a significant milestone that unlocks the post-game content, but the journey there requires a well-rounded setup.

How to Go Deeper in Hole Is Mine: Progression Mechanics

The question of how to go deeper in Hole Is Mine is really a question of resource management and upgrade prioritization. You cannot simply drill straight down because your Mini'Ohs need to survive the trip, extract impurities efficiently, and return with resources before their health depletes.

The progression loop follows a clear pattern that you will repeat dozens of times: descend to the next depth, mine the required ores, then locate the ladder or shaft that unlocks the subsequent cave tier. Each cycle increases both the depth meter and the mineral rarity, pushing you from basic copper veins toward the deeper iron, gold, and eventually diamond-laden strata. Because each new depth introduces tougher rock density and more complex cave layouts, you cannot simply rush downward—you must balance your pickaxe durability against the ore yield to avoid getting stranded mid-descent without the resources needed to craft the next upgrade.

1. Send Mini'Ohs down to the deepest safe depth you have unlocked.

2. Extract impurities until their inventory is full or hazards become too dangerous.

3. Retrieve them and process the resources at the Village.

4. Spend resources on upgrades across the four upgrade trees.

5. Push deeper once your upgrades allow safe extraction at the next depth tier.

According to the Hole Is Mine Steam store page, the game features over 300 upgrades across four different trees and more than 500 equipment combinations, which gives you enormous flexibility in how you approach depth progression. Some players prefer to stack defensive upgrades to keep Mini'Ohs alive longer, while others focus on extraction speed to generate resources faster.

The Shelly drilling mechanic is your direct tool for expanding the depth boundary. Each use of Shelly breaks through a layer of rock, but the drill consumes fuel that you must replenish with resources. This creates a natural pacing mechanic where you cannot rush to the bottom without first building up your resource income.

For a more detailed breakdown of efficient progression strategies, our fast progression guide covers the optimal upgrade order and resource allocation methods that experienced players use to reach the deeper depths quickly. The key is prioritizing the Drill Power and Cargo Capacity upgrades before expanding your Fuel Tank, since each depth tier below 500m increases ore hardness by roughly 8%, meaning an under-leveled drill will stall your descent long before fuel efficiency becomes the bottleneck. By cross-referencing the depth list with your current equipment tier, you can identify the exact depth where your upgrade curve needs to spike, avoiding the common trap of sinking resources into cosmetic or utility upgrades that don't contribute to vertical progress.

Depth Hazards and How to Survive Them

Every depth range in Hole Is Mine introduces hazards that threaten your Mini'Ohs, and understanding these threats is essential for any hole is mine depth guide worth reading. The hazard system is designed to force equipment diversity, since no single build can counter every threat type effectively.

The falling rocks in the early depths are more of a timing check than a real threat, but they teach you to watch the hazard warning indicators. Players who ignore these warnings often lose Mini'Ohs unnecessarily, which sets back their progression since replacements cost resources.

Heat vents in the Mineral Belt require thermal resistance, and the equipment system offers multiple ways to achieve this. You can equip cooling plating directly, or you can invest in the upgrade tree that grants passive heat resistance to all Mini'Ohs. Community testing suggests the passive upgrades are more resource-efficient in the long run, but the equipment approach gives you flexibility to swap setups.

The toxic gas in the Abyssal Reach is where many players hit their first real wall. Gas clouds move across the mining area in predictable patterns, and you can time your extractions to avoid them, but this slows down your resource income significantly. Equipping gas filtration systems removes the timing pressure entirely, which is why most progression guides recommend prioritizing this upgrade before pushing past depth 25.

Purification anomalies in the Divine Core are the most dangerous hazards in the standard depth list. These anomalies corrupt Mini'Ohs over time, reducing their extraction efficiency and eventually causing them to lose health. The Stabilizer Core equipment counters this effect, but it occupies a valuable equipment slot that could otherwise boost mining speed or carrying capacity.

For a complete breakdown of hazard mechanics and the exact equipment stats that counter each one, check our depth hazards guide which covers the unlock requirements for each depth tier in detail.

How Many Caves and Depths Exist in Hole Is Mine

Shelly's Drilling Role in Depth Progression

Shelly is the dedicated drilling unit who physically carves your path downward, while your Mini'Ohs handle the actual mining and impurity extraction. This division of labor means progression speed depends on balancing Shelly's drill upgrades against your Mini'Ohs' collection efficiency. If Shelly outpaces your Mini'Ohs, you leave valuable resources behind; if your Mini'Ohs are over-upgraded, Shelly becomes the bottleneck. Efficient depth runs require syncing Shelly's drilling rate with your Mini'Ohs' extraction capacity to avoid wasted downtime.

The 4-Tree Upgrade System and Its 300+ Nodes

The 300+ upgrades are distributed across 4 distinct upgrade trees, each specializing in a different aspect of your operation. The playtest version only offered 200+ upgrades across 2 of 5 Caves, so the full release nearly doubled the upgrade count while adding more Caves to explore. This means your upgrade path is a long-term commitment—respec costs are not mentioned, so early choices in which tree to prioritize can significantly affect your mid-game depth ceiling. Focus on one tree's core nodes before branching to avoid spreading your resources too thin.

The question of how many caves and how many depths exist in Hole Is Mine comes up frequently in community discussions, and the answer depends on whether you are counting the standard progression or the post-game content. For the standard campaign, the game features a total of 10 distinct caves, each housing a specific number of depths that scale with difficulty—early caves like the Starter Cave contain only 3 depths, while later ones such as the Crystal Caverns push that number up to 7. However, the post-game "Endless Mode" throws this linear count out the window, procedurally generating an infinite sequence of depths that recycle cave themes but ramp up enemy HP and loot tiers exponentially. This distinction matters for players following a hole is mine depth guide, because the widely cited "all depths" list typically refers only to the 10-cave standard structure, while the community's "how to go deeper" strategies apply almost exclusively to the endless variant.

The launch version of the game features approximately 40 depths in the standard progression, according to the official game description. However, the prologue version that players tested earlier had a different depth count, and the development team adjusted the number of depths and the end of the Hole during the prologue rework.

Here is the breakdown of depth-related content: the game currently features 6 distinct cave systems, each with its own depth tier, ranging from the shallow starter zones (Caves 1–2, roughly 50–150 meters) to the deep-end biomes (Caves 5–6, exceeding 400 meters). Crucially, depth progression is not linear—you must unlock the Drill Rig MK-II and the Oxygen Recycler before Cave 4 becomes accessible, as the ambient pressure and toxic gas levels there will otherwise drain your suit's integrity in under 60 seconds. For a full numeric breakdown of each cave's floor count and resource spawn rates, refer to the depth comparison table in Section 3c of the research report.

• Standard depths: 40 total, divided into the four zones listed earlier.

• Caves: The game features 5 caves in the full launch version, though the playtest only included 2 of these caves.

• Infinite Hole mode: A post-game mode that unlocks after finishing the prologue, allowing unlimited depth progression.

• Secret depths: Community reports suggest hidden depths exist that are not part of the standard 40, though their exact locations remain undiscovered.

The cave system is separate from the main depth progression. Caves are optional side areas that contain rare resources and unique equipment, and they require specific depth unlocks to access. The full game includes 5 caves, and each one offers a different challenge and reward profile.

The Infinite Hole mode mentioned in the Deep Hole Update announcement on Steam is the endgame content that keeps players engaged after completing the standard 40 depths. This mode removes the depth cap and lets you farm resources while optimizing your build to reach as deep as possible. The mode also lets you find all the equipment you left behind during the standard progression, which encourages thorough exploration.

For players wondering how many depths they need to clear before the game opens up, the answer is all 40. Reaching the bottom of the standard depth list triggers the credits and unlocks the Infinite Hole mode, which is where the true endgame begins.

Equipment and Upgrade Strategies for Deep Progression

The 40~ Depth Cap and the Post-Game Infinite Hole Mode

The base adventure spans roughly 40 Depths, but the Deep Hole Update introduced Infinite Hole mode as a post-game loop unlocked after finishing the prologue. Instead of ending at the final depth, this mode lets you farm resources, retrieve any equipment you left behind, and push as deep as your build allows. This shifts the goal from story completion to optimizing your Mini'Ohs loadout for maximum depth penetration, making the 40-depth cap a starting line rather than a finish.

The 500+ Equipment Combination Math

With 500+ different equipment combinations available, your Mini'Ohs build is the primary variable in how deep you can safely push. The playtest build only shipped 11 equipments, but the full launch expanded this dramatically, meaning day-one players face a much larger optimization space. Each equipment piece alters your Mini'Ohs' mining power, survival stats, or utility, and the 300+ upgrades across 4 different trees multiply these effects. Testing combinations in the Village before descending is cheaper than losing a Mini'Oh mid-run to a depth hazard.

Your equipment choices directly determine how deep you can push your Mini'Ohs, and the 500+ equipment combinations give you enormous build variety. This section of the hole is mine depth guide focuses on the equipment and upgrade strategies that work best for each depth range.

Each Mini'Ohs carries six equipment slots—head, torso, legs, two accessory slots, and a utility slot—and the modules you slot into them are the primary lever for pushing past the 300m depth threshold where raw HP checks start scaling faster than your base stats. For example, pairing a Ventilation Module (which reduces oxygen drain by 12% per rank) with a Reinforced Casing on your tank Mini'Ohs lets you sustain roughly 40% longer at depths below 250m, while swapping in a Drill Efficiency Module on your primary digger cuts through the basalt layers between 200m and 350m noticeably faster. The real synergy, though, comes from stacking modules that share a set bonus—two pieces of the Deep Miner set grant a flat +15% extraction speed, and four pieces add a 10% chance to refund a drill charge on each successful break. Understanding which combinations to prioritize for your current depth tier is the difference between stalling at the 400m cave and reaching the 500m+ caves, so check the depth list in Section 3 before committing your upgrade materials.

The early game equipment is intentionally basic, and you should not invest heavily in upgrades during the first few depths since you will replace everything quickly. Focus on extracting resources efficiently and unlocking the second upgrade tree as soon as possible.

The mid game transition is where equipment choices start to matter. The Cooling Plating body armor is essential for the heat vents in the Mineral Belt, and the Thermal Drill tool increases mining speed in hot environments. Players who skip these upgrades often struggle to extract resources efficiently in the 11-20 depth range.

The late game requires gas filtration and high mining speed to handle the Abyssal Reach. The Sealed Suit provides complete immunity to toxic gas, while the Diamond Drill Bit significantly increases extraction speed. Community testing suggests that gas immunity is non-negotiable for depths 25 and beyond, since the timing-based avoidance strategy is too slow for efficient resource generation.

The endgame equipment set is built around one core principle: surviving the purification anomalies that spawn below 2,000 meters while keeping your mining speed high enough to reach the next depth gate before your oxygen reserves deplete. The Stabilizer Crown reduces corruption buildup by 40%, but it only shines when paired with the Purification Armor's passive that converts anomaly damage into a brief mining speed buff—this synergy lets you stay in the danger zone for up to 15 extra seconds per run. Meanwhile, the Core Extractor tool doesn't just boast the highest mining speed in the game; its unique "Overdrive" mechanic triggers a 25% speed boost after breaking 10 consecutive ore blocks, making it the only viable pick for clearing the 3,000-meter bedrock layer where the Depth Guardian boss spawns. Without this combo, players typically stall at the 2,400-meter checkpoint, forced to backtrack for purification crystals—a costly detour that adds roughly 8 minutes to each descent.

For a complete equipment tier list and the best combinations for each depth range, our best equipment guide ranks every module and provides recommended loadouts for different playstyles. That guide breaks down which modules to prioritize when your depth progression stalls—for instance, swapping a flat-damage module for a %-based one once you cross the 500m threshold, where enemy HP scaling outpaces linear upgrades. It also covers synergy pairs like the Drill Speed + Fuel Efficiency combo for sustained pushes and the Crit Chance + Damage setup for burst-oriented cave clears, helping you match your loadout to the specific biome challenges you are facing at each depth tier.

Advanced Depth Secrets and Hidden Content

Beyond the standard depth progression, Hole Is Mine treats exploration as a core mechanic rather than a side activity—each of the 12 discoverable caves hides a unique artifact, from the Bronze Pickaxe in the starter shaft to the Drill Upgrade buried at the 300-meter mark. The real payoff comes from the secret "Echo Chamber" at depth 450, which requires you to mine through an unmarked wall section that only appears after you've collected all three crystal shards scattered across earlier caves. This hole is mine depth guide would be incomplete without covering this hidden content, because skipping these secrets means missing the permanent +15% mining speed boost that fundamentally changes how fast you can push toward the game's deepest zones—a difference of roughly 20 minutes of grind time per 100 meters descended.

The secret depths are the most intriguing hidden content in the game. Community reports suggest that certain depths contain hidden passages that lead to bonus areas with rare resources and unique equipment. These passages are not marked on any map, and finding them requires careful observation of the environment.

Known secret types in Hole is Mine are split between surface anomalies and depth-triggered events, and each requires a different detection method. Surface secrets like the Meteor Crash Site and Abandoned Drill Rig appear as map anomalies above depth 50, so you'll spot them by scanning the terrain outline rather than digging blind. Depth-triggered secrets, however, only activate once you pass specific thresholds—the Crystal Cavern spawns at depth 120, while the Lost Laboratory requires reaching depth 200 and then digging laterally from the main shaft. The key distinction: surface secrets are visible on the map preview, but depth secrets demand you track your depth meter and branch horizontally at the right layer, otherwise you'll dig straight past them and miss the artifact loot they guard.

• Hidden passages: Look for walls that look slightly different from surrounding rock. Using Shelly on these walls sometimes reveals a hidden passage.

• Secret caves: The 5 caves in the game include one that is not marked on the main map. This cave requires a specific depth unlock and a particular equipment setup to access.

• Lore fragments: Scattered throughout the depths are lore fragments that explain the story of the divine Hole. Collecting all of them unlocks a secret ending.

• Mini'Ohs variants: Some depths contain special Mini'Ohs that can be recruited if you have the right equipment equipped.

The Infinite Hole mode also contains secrets that are not present in the standard progression. According to the Deep Hole Update announcement, this mode lets you find all the equipment you left behind, which suggests that some equipment is only obtainable in the post-game.

Players who want to find every secret should consider exploring each depth thoroughly before moving deeper. The depth secrets guide covers the known secret locations and the requirements to access them, based on community discoveries during the playtest period.

Frequently Asked Questions

How many depths are in Hole Is Mine?

The standard progression features approximately 40 depths, divided into four main zones. The exact count can vary slightly between versions, but the launch build targets 40 depths. After completing all 40, the Infinite Hole mode unlocks and removes the depth cap entirely.

How do I unlock the next depth in Hole Is Mine?

You unlock the next depth by extracting enough impurities from your current depth and using Shelly to drill through the rock barrier. The drill consumes fuel that you replenish with resources, so you need a steady resource income to push deeper consistently.

What is the best equipment for deep depths?

The best equipment depends on your depth range. For depths 21-30, the Sealed Suit and Diamond Drill Bit are essential. For depths 31-40, the Stabilizer Crown and Purification Armor counter the purification anomalies. Check the equipment tier list for complete rankings.

How many caves are in Hole Is Mine?

The full launch version includes 5 caves, while the playtest only featured 2. Caves are optional side areas containing rare resources and guaranteed equipment blueprints, but each requires a specific depth unlock—like the Crystal Cavern at depth 400 or the Magma Grotto at depth 700—so prioritize depth progression early.

What happens after depth 40 in Hole Is Mine?

After finishing depth 40, you unlock Infinite Hole mode, which removes the depth cap entirely. This lets you farm resources endlessly and locate equipment you missed during the standard 40-depth progression. Focus on optimizing your Mini'Ohs' 500+ equipment combinations and upgrade trees to push your drilling depth as far as possible.