Treasure chests can be earned by completing quests, found while mining, can be bought with tickets, earned from scientist excavations and be traded in a trading post.
Normal chests
The Key of Luck relic increases the spawn frequency of chests by 5%.
Loot
| Reward probabilities | |
|---|---|
| Reward | Chance |
| Money | ?% |
| Timelapse | ?% |
| Minerals | ?% |
| Buff | ?% |
| Recipe | ?% |
| Equipment | ?% |
| Scientist | ?% |
| Oil | ?% |
Rewards amount regarding money and minerals depend on the maximum depth you have reached. The amount of money can be increased by 10% with the Nugget of Attraction relic. The higher your oil pump level is the more oil you get from chests.
Timelapse: duration can be increased by 10% with the Book of Time relic
- Min 3 minutes
- Max 10 minutes
Recipes and equipment:
- Basic Nuclear Engine
- Spike Drill
- Multi Partioned Fan
- Large Cargo
- Intermediate Nuclear Engine
- Heat Pump
- Advanced Nuclear Engine
- Monster Drill
- Giant Cargo Bay
- Fission Engine
- Sifting Drill
- Hydrogen Coolant System
- Drill King Engine
- Smashing Drill
- Bihydrogen Coolant System
- Fat Cargo
- Drill Lord Engine
Golden Treasure Chests
Golden chests are golden colored and give better rewards. They are very rare. Golden Chests are also a reward from quests 1, 5, 6, 7 and 8 at the Underground City. The Key of Gold relic increases the spawn rate of golden chests by 5%.
Loot
| Reward probabilities | |
|---|---|
| Reward | Chance |
| Money | ?% |
| Timelapse | ?% |
| Recipe
(If you already have recipe or equipment, you will get money reward instead) |
?% |
| Minerals | ?% |
|
Depth or oil |
?% |
| Metal Detector | ?% |
| Manager | ?% |
| Item "Heal" or if you already have it then 20 tickets | ?% |
| Item "Time Travel" or if you already have it then 33 tickets | ?% |
Money: amount can be increased by 10% with the Nugget of Attraction relic
- Min $0
- Max $10 trillion (not confirmed, could be limited with variable size)
Money reward equation for Golden Chest is depth*depth*depth*(depth*.2)*10*(1+(Math.random()*7))
For example if you are at a depth of 100km the minimum amount of money would be $200,000,000 and maximum amount would be $1,600,000,000.
Timelapse: duration can be increased by 10% with the Book of Time relic
- 6 hours
Minerals: amount and type depends on your maximum depth
Recipes:
- Giant Cargo
- Sifting Drill
- Hydrogen Coolant System
- Fission Engine
- Fat Cargo
- Smashing Drill
- Bihydrogen Coolant System
- Drill King Engine
- King Cargo
- King Drill
- Trihydrogen Coolant System
- Drill Lord Engine
Other:
Depth or oil:
- +3 depth when you haven't reached depth of 40km
- +1 depth when you haven't reached depth of 603km
- oil after when you have reached depth of 603km, amount depends on your oil pump level
Tickets:
- 20 tickets
- 33 tickets
Spawn timing
There is no way to predict exactly when the next chest spawn. However, you can make a best guess approximation and measure average time. Spawn rate depends strongly on maximum depth you have achieved. It is also affected by activity in game, if you click or scroll few times in every 30 second you have slightly higher change to spawn a chest.
In this table there are calculated average times between chest spawns. For example it will take about 11 hours to spawn next golden chest at depth of 100km. But time may vary from 2000 minutes to 40 hours. That's why golden chests are so rare. Also there are possibility that regular Treasure chest will spawn on Golden chest and Golden one will disappear. And the more time the golden chest is out the other chests will have a harder time to spawn.
| Depth | Treasure chest | Golden chest |
|---|---|---|
| 50km | 28min | 60h |
| 100km | 5min | 11h |
| 150km | 3min | 7h |
| 200km | 2min | 4h |
| 300km | 1min | 3h |
| 500km | 1min | 2h |
| 750km | <1min | 1h |
Average time is calculated based on 30-day single run non-active gameplay