The heavy engineering depot constructs tanks and other armoured vehicles, and is also required to research Fortification and Construction upgrades.
Notes:
- You must have researched Stainless Steel (Metallurgy Level 1) at the Foundry.
- Units here have a ramp cost of 3-4 oil each.
Units manufactured[]
Light tanks[]
Medium tanks[]
Heavy tanks[]
Tankettes/Tank destroyers[]
SPGs and Assault Guns[]
Research[]
Construction 
[]
Cement Industry[]
- +10% to structure hitpoints
- Build speed increased.
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Replaceable Parts[]
- +10% to structure hitpoints
- Build speed increased.
| Cost | Requirements | Leads to |
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Precision Engineering[]
- Increases border push effect of all fortresses.
- Increases offensive power and range of all fortresses.
- Unit garrison room size increased.
| Cost | Requirements | Leads to |
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