The lack of adequately preserved archives presents a significant obstacle to research into ancient krogan history. Nevertheless, recent archaeological discoveries have shed new light on the topic, revealing a society once rich with cultural, architectural, and artistic accomplishments.
Newly discovered ruins reveal that the krogan had particularly advanced understandings of structural and geotechnical engineering, as compared to other cultures at similar stages of development. Old krogan architecture demonstrates seismic loading techniques that would have both resisted earthquakes and diffused the small-scale vibrations from vehicles in their sprawling cities. Curiously, however, Tuchanka has little natural tectonic activity. Instead, researchers believe the ancient krogan were concerned with safe cohabitation with one of the planet's apex predators -- Kalros, the Mother of all Thresher Maws.
Prior to the genophage, krogan population growth was limited by predation, disease, and war. Even so, the birth rate exploded once the krogan achieved industrialization, leading to wars over resources and living space. Other species on Tuchanka suffered greatly as the krogan expanded. When the krogan ran out of land, they settled into an arms race that ended in nuclear devastation. Tuchanka's relatively short Golden Age was at an end.
But this ancient history may yet aid the modern krogan. Some of the techniques and technology discovered in the ruins could be used to improve standard colonization equipment, signaling economic renewal for the krogan at last.