Xindi-Aquatic language
The Xindi-Aquatic language was the very complex language used by the Xindi-Aquatics. It consisted of high or low pitch hums that were similar to those produced by Terran whales.

The language switched to SONAR when the past tense was used. ()

Hoshi Sato said that she thought the Xindi-Insectoid language was difficult while trying to translate an Aquatic message. () Commander Dolim heard the language his entire life, but it never came easily to him. After Hoshi's capture, Jonathan Archer was able to communicate with the Aquatics without learning this language as they had, by this time, learned the Human language. ()

 
Languages