Advanced sea improvement. Requires Refrigeration.
- Oil strategic resource (sea-based)
Like the land-based Oil Well, the Offshore Platform grants access to water-based sources of Oil and gives a large Production bonus to nearby cities. Notably it requires Refrigeration on the edge of the Modern Era instead of Biology, meaning these sources of Oil are connected slightly later than those on land. Constructing it requires one Work Boat.
The offshore platform is an important late-game improvement as it provides access to the highly prized oil resource, but only when that resource is in the ocean (workers construct wells to access oil that is on land). Work boats are consumed when they construct an offshore platform.