In 2537, a prowler, the UNSC Razor's Edge, managed to attach one to a Covenant ship at the Battle of New Harmony. The warship was tracked to K7-49, a Covenant shipyard facility seventeen light years from the furthest reaches of human space.
This sparked Operation: PROMETHEUS, in which the all 300 of the SPARTAN-IIIs in Alpha Company were deployed to destroy the shipyard. Although the mission was a strategic victory, with the Covenant abandoning what was left of the facility, Alpha Company was wiped out in its entirety.
- A Covenant counterpart to this exists, called the spy probe, which functions identically. One such device was used to track the UNSC Iroquois from the Battle of Sigma Octanus IV back to Reach, which led to the Fall of Reach soon after.
- It could be conjectured that the Covenant spy probe may be based upon captured telemetry probes, as is the case with many other Covenant technologies like Associated Intelligences. However, the reverse could also be true.