ONI Epsilon Site is a facility of the UNSC Office of Naval Intelligence located in Sector 93 of Endeavor.
While operated by the Office of Naval Intelligence, the site has become a secondary location for the Endeavors Police Force. As the prime location of the Police Department makes it an easier target for espionage, the ONI Epsilon Site provides greater security. All information, civilian or not must go through rigorous levels of identification and clearance before it is allowed out of the building, if at all.
Designed with utmost precision it is completely identical to the Alpha Site on Earth. The complex is built on an artificial island that resides in a walled pool of water, only accessible by a bridge running the length of the complex. The island has an additional security zone, also surrounded by a wall. The base's main building is essentially a massive cube in the other end of the security zone. Deep below the main building resides the Superintendent's Data Center.