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In-game description:
"Reduces the amount of resources that can be plundered after a successful attack against you. Vault can be used to secure a small amount of resources.

The Underground Bunker can reduce the percentage of resources which can be looted after an attack against you. The higher the level, the smaller the percentage of resources that can be stolen. The vault provides additional storage to completely secure some resources from being looted. The greater the level of the bunker, the more resources can be secured."

While the Underground Bunker is enormously useful, required time to build jumps quite extremely past level 5, making it a hard decision to choose wether to upgrade or not.

Costs
Level
Metal
Crystal
Gas
Build Time* Capacity
0 -- -- -- -- 0 metal, 0 crystal, 0 gas
1 2,000 1,000 500 00:01:15 11,400 metal, 7,600 crystal, 3,800 gas
2 4,000 2,000 1,000 00:06:15 17,600 metal, 11,700 crystal, 5,800 gas
3 8,000 4,000 2,000 00:31:15 25,500 metal, 17,000 crystal, 8,400 gas
4 16,000 8,000 4,000 02:36:15 35,200 metal, 23,400 crystal, 11,700 gas
5 32,200 16,000 8,000 13:01:15 47,200 metal, 31,400 crystal, 15,700 gas
6 64,000 32,000 16,000 65:06:15 61,700 metal, 41,100 crystal, 20,500 gas
7 128,000 64,000 32,000 325:31:15 79,200 metal, 52,800 crystal, 26,400 gas
8 256,000 128,000 64,000 100,000 metal, 66,700 crystal, 33,300 gas
9 512,000 256,000 128,000 124,600 metal, 83,100 crystal, 41,500 gas
10 1,024,000 512,000 256,000 153,100 metal, 102,100 crystal, 51,000 gas
Reqs. Underground Bunker requires Metal Storage, Crystal Storage and Gas Tanks on Lv.2 each.
Legend *modified by Robotics Factory and Nanite Factory.


Underground Bunker
Level Unlocks
1 41% Resource Protection
2 42% Resource Protection
3 43% Resource Protection
4 44% Resource Protection
5 45% Resource Protection
6 46% Resource Protection
7 47% Resource Protection
8 48% Resource Protection
9 49% Resource Protection
10 50% Resource Protection


This can be further modified by (a negative) Glory Score.

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