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The Swarm species language was the language of the Swarm species, a territorial and hostile species which controlled a vast region of space in the Delta Quadrant, encountered by the crew of the USS Voyager in 2373.
The language was so different from other known languages that it initially could not be translated by the universal translator. After some work on the UT by Harry Kim, a rough translation of the language became possible. A transmission in this language was roughly translated as "Too late...Should have listened." (VOY: "The Swarm")