- Depth Incremental caves are the core progression loop: dig deeper layers to unlock better minerals and upgrades.
- Mineral tiers matter: each new cave layer introduces higher-value resources that unlock advanced tech tree nodes.
- Upgrade priority: fuel/energy capacity and hull strength first, then magnets and spawn rate boosts.
- Watch for walls: hardened terrain and dense tunnel walls punish players who neglect hull upgrades.
- Run smart: end a run before crashing to keep collected minerals banked for the tech tree.
How the Caves Work
The caves are the heart of Depth Incremental. Every run sends your digging craft downward through layered strata, where you collect minerals, burn fuel, and take hull damage from walls and obstacles. Each layer you break into introduces tougher ground, new mineral colors, and fresh tech tree branches.
The basic loop is simple but addictive:
| Cave Element | Role | Why It Matters |
|---|---|---|
| Fuel/Energy | Limits run length | Upgrades extend how deep you can travel |
| Hull Strength | Absorbs wall impacts | Hardened terrain destroys weak hulls fast |
| Minerals | Primary currency | Red, blue, and rarer tiers unlock tech nodes |
| Walls | Obstacles | Block progress; require hull or careful piloting |
| Missions | Bonus objectives | Grant performance flags for advanced upgrades |
| Soil Toughness | Layer scaling | Deep caves resist digging; upgrades soften it |
Progress in Depth Incremental is a balance of depth versus durability. A bigger fuel tank means nothing if your hull shatters on the first reinforced wall. Spread upgrades across both.
Cave Layers and Mineral Tiers
Caves are divided into distinct soil regions. Early layers are soft and packed with common red minerals. As you descend, ground hardness rises and new mineral tiers appear — but they often ignore your existing magnets until you research dedicated upgrades.
| Layer Depth | Ground Type | Minerals Found | Key Challenge |
|---|---|---|---|
| Surface zone | Soft soil | Red minerals (common) | Learning piloting controls |
| Mid caves | Mixed soil, gaps | Red + big variants | Fuel management, narrow gaps |
| Deep caves | Hardened terrain | Blue minerals | Walls, hidden minerals in terrain |
| Lower region | Very hard ground | Rarer tiers (purple tier locked in early builds) | Overload, control impairment |
Key observations about mineral tiers:
- Red minerals fund most early and mid-game upgrades. Never stop collecting them, even in blue-rich layers.
- Blue minerals appear in deeper caves and unlock energy, shield, and advanced magnet upgrades.
- Big variants are worth double — spawn-rate upgrades add a chance for them to appear.
- Hidden minerals sit inside cracked walls; certain upgrades reveal or knock them loose.
Deeper layers frequently have harder ground that ignores low-level hull strength. If you unlock a new region but keep crashing within seconds, return to shallower caves and farm upgrades first.
Shallow Farming
- Safe and steady
- Great for red minerals
- Ideal for early tech tree
Mid-Depth Runs
- Balanced risk and reward
- Mix of red and blue minerals
- Best fuel-to-income ratio
Deep Dives
- High-value blue minerals
- Requires strong hull and shields
- Only worth it with maxed energy
Upgrade Priority in the Caves
With dozens of tech tree nodes competing for your minerals, purchase order decides how fast you progress. Use this recommended priority sequence:
| Priority | Upgrade | Reason |
|---|---|---|
| 1 | Fuel/Energy Tank | Directly extends every run's depth ceiling |
| 2 | Max Hull | Lets you smash walls instead of dodging them |
| 3 | Mineral Magnet | Auto-collects minerals, reducing missed pickups |
| 4 | Spawn Rate | More minerals per run, plus big double-value variants |
| 5 | Soil Toughness Reduction | Softens deep ground for easier digging |
| 6 | Reveal Hidden Minerals | Surfaces gems embedded inside walls |
| 7 | Widen Gaps | Quality-of-life; lowers crash risk |
Completing missions earns performance flags. Spend these on advanced upgrades — such as amplified magnets that break minerals out of bricks — that ordinary minerals cannot buy. Missions rotate, so check objectives before each run.
Watch for the color coding on the tech tree: red means unaffordable, green means purchasable, and purple means maxed. Locked nodes typically require a deeper cave layer or a performance flag.
Deep-Run Strategy: Step by Step
Follow this routine to maximize every cave run:
Check Missions First
Review active missions before deploying. Aligning your run with objectives earns performance flags alongside normal mineral income.
Spend Everything
Dump all minerals into upgrades before deploying. Unspent currency does nothing — fuel capacity and hull upgrades pay for themselves immediately.
Dive Steeply Early
Descend fast through soft upper layers. Red minerals collect almost automatically with a decent magnet, so prioritize reaching the deeper soil regions.
Slow Down in Hard Ground
In hardened terrain, pilot carefully through gaps instead of ramming walls. Save hull integrity for unavoidable collisions.
Exit Before You Crash
When fuel runs low, grab final minerals and let the run end cleanly. A controlled finish banks everything you collected.
An amplified magnet can break minerals out of brick walls, which also clears a path through obstacles. Deep runs become significantly safer once you unlock this tech.
Cave Progression Checklist
Track your cave mastery with these milestones:
Cave Progression Goals:
- Max out the fuel tank expansion
- Reach max hull strength (5 levels)
- Unlock the blue mineral layer
- Earn 3 performance flags from missions
- Research the amplified magnet upgrade
- Complete a 20 km single-run dive
Like most incrementals, cave difficulty comes in waves: a new layer feels brutal, then upgrades catch up and it becomes trivial before the next wall. If a layer feels impossible, you are simply one or two upgrades away from breaking through.
Caves FAQ
Q: What are the caves in Depth Incremental?
The caves are the main gameplay area — layered underground strata you dig through during runs, collecting minerals like red and blue gems while managing fuel and hull integrity. Each deeper layer holds better resources and tougher terrain.
Q: Why do blue minerals ignore my magnet?
Blue minerals in deeper caves require dedicated blue-tier magnet upgrades. Your red-mineral magnet does not affect them, so research the blue magnet branch as soon as you unlock the blue layer.
Q: Should I upgrade fuel or hull first?
Alternate between them. Fuel extends how far you can travel, while hull lets you survive the walls you encounter along the way. A good rule is one fuel upgrade for every one or two hull upgrades.
Q: What are performance flags used for?
Performance flags are earned by completing missions (typically every four missions) and are spent on advanced tech tree upgrades that minerals alone cannot purchase, such as gravity tech and amplified magnets.