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Once the vault was opened however, millions of Swall were suddenly revivified by the life pods, crawling out of them with full memories of the day of their excitation, almost a hundred years ago now. While a complete shock, logic dictates that the Andoen aliens did not produce a single life vault on a random planet capable of harboring life, and as such Vetuck was searched, and a matching vault that allowed the Vetuckers to be revived was found shortly after.
Your scientists are not exactly sure why the life vaults were present on the planet. Having a secondary method of surviving an extinction level event like this makes sense, but the planets were not ever colonized by the Andoen aliens, as far as you know. Their Azurium structures would be more present in the fossil record and deep strata of the planets crust. It also seems highly unlikely for them to have built the life pods for another species entirely, and given their depth in the planet crust, it seems they were likely built on the surface over a <span class="mu-s">hundred million years ago</span>, which was before intelligent life evolved on those planets to begin with.
Because these were clearly built during a period long ago, your recent terraforming of Xin means that no Life-Vault will be found there. The Blue Hazaar are truly no more.
Because of how long ago they were built, it seems most likely they were an early form of expansion or future-proofing for the planets, perhaps with the intent of a future technology being able to “send” over people to be produced by the pods to colonize the planet, but that technology was never developed. It could also be those planets once housed Andoen aliens, but died off before the pods could be opened...