So Close and Yet So Nar
From A KoL Wiki
The Sonar Room is dark, quiet, and smells like batbugbears. The only light comes from the glowing green and red lights on a trio of machines against a wall. One of them emits a steady "PING" every few seconds, one rumbles with a steady "whurmwhurmwhurm," and one stutters with a syncopated "boom, chuck! Boomchuck!" You're sure the noise helps the batbugbears triangulate, or something, but you can almost dance to it.
A computerized voice says, "Commencing Sonar Survey. Rerouting Power From Elevator to Sonar Instrument Array."
Stellar.
Occurs the first time you enter Sonar.