Aekhhwi'rhoi

Memory Beta, the wiki for licensed Star Trek content.

Aekhhwi'rhoi is the name given to the underground maze of stone lined sewer tunnels that existed beneath the city of Ki Baratan on Romulus. Numerous Nhaidh were known to be sighted moving around the location.

The Unification movement were known to make use of the tunnels to meet with Starfleet operatives. (TTN novel: Taking Wing)