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This page contains information regarding Star Trek: Short Treks, and thus may contain spoilers.

Berellium was a place attacked by the Tholians in the mid-23rd century. There were only two survivors, Thira Sidhu and her husband. This place, and the attack, were mentioned in the personnel file of Cadet Sidhu. (ST: "Ask Not")

The attack is described as having occurred just a couple of years before "Ask Not", which itself was not dated.
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