Subterranean Exploration (Civ5)

Subterranean Exploration
Technology of the Airship Era
Introduced in Gods & Kings
Scenario	Empires of the Smoky Skies
Cost	1440
Technologies
Required	Land Leviathan (technology)
Required	Land Leviathan (technology)
Leads To
Leads To
Enables
Buildings	Subterranean Outpost
Wonders	Subterranean Colony

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 "One just principle from the depths of a cave is more powerful than an army."
– José Martí