Civilization II · Technologies
Combustion
Requires Explosives + Refining
The internal-combustion engine, powering submarines and later automobiles and aircraft.
In the tech tree
- Requires
Explosives
Refining- Leads to
Automobile
Flight- Enables
Submarineunit
About technologies in Civilization II
Research accumulates from trade in your cities — light bulbs in the city view — and each completed advance unlocks units, buildings, governments or wonders while opening the path to further advances. The order you research in is the single biggest strategic decision of the early game.
Strategy — Beeline matters more than breadth: decide early whether you're rushing Monarchy for growth, Literacy for the Great Library, or military techs for an early war.
