Here's the reworded MDX content, preserving meaning and structure:
The year **519 BBY** saw the unfolding of the following occurrences.
## Events
- On a major fragment of ancient [Polis Massa](/article/polis_massa), the [Archaeological Research Council](/article/archaeological_research_council) under [Kallidah](/article/kallidah) set up a [Research Base](/article/polis_massa_base). [Kallidahin](/article/kallidahin) [archaeologists](/article/archaeologist) initiated comprehensive surveys and excavations across the Polis Massa [asteroid](/article/asteroid) belt. Their goal was to gather insights about their [Eellayin](/article/eellayin) forebears, as well as other [alien](/article/alien) [species](/article/species). They utilized [cloning](/article/cloning) techniques acquired from the [Kaminoans](/article/kaminoan) in their research. [6] [7]
## Sources
- [Star Wars: Complete Locations](/article/star_wars:_complete_locations_(2016)) (Initial mention) (Mentioned indirectly)
## Notes and references
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