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A relic of pre-War times, PoseidoNet was the internal network providing instantaneous communication between various branches of the Poseidon Energy cartel. The network continued to function after the Great War, and was used by the Enclave (which likely also used it before the war).

It plays a fairly minor role in Fallout 2, but foreshadows the existence and extent of the power of the Enclave.

In Fallout: New Vegas, some of the terminals in HELIOS One are linked to PoseidoNet.[1]

In Fallout 76, the network is connected to Poseidon Energy Plant WV-06.

Facilities Linked by PoseidoNet

Active in 2242:

Offline in 2242:



PoseidoNet is mentioned in Fallout 2, Fallout: New Vegas, and Fallout 76.


  1. 1.0 1.1 Helios One terminals
  2. DataPlex 2000 SmarTerminal: "{104}{}{Welcome to PoseidoNet. Enter Menu Selection:}"
    "{225}{}{Welcome to PoseidoNet Help system. We regret that your Help files are currently out of date, and unavailable. Seek Help file update? (Y/N)}"
    "{228}{}{User Help file update not available with trial PoseidoNet software. Please purchase full version for full access to all further updates. Your trial period for PoseidoNet access is 59, 439 days overdue.}"
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Reactor Maintenance and Repair Robot control terminal: "{140}{}{This terminal is used to input command data for the robotic maintenance and repair unit assignedto Poseidon Oil'Reactor #5. This terminal also allows access to PoseidoNet.}"
    "{220}{}{Uplink with central PoseidoNet initiated. Enter Primary Security Access Code Sequence: 70Y644, 008Z21, 9X7299, A46123.}"
    "{250}{}{This Terminal Closed For Security Reasons. Please inform PoseidoNet Supervisor.}"
    "{330}{}{Security Access Code Sequence Accepted. Welcome to PoseidoNet: }"
    "{350}{}{Searching Comlinks... Searching... Iron Mountain... Offline, NORAD... Offline, SAC... Offline. Searching PoseidoNet... --More?--}"
    "{360}{}{Active PoseidoNet Stations: Atomic Powerplant #5, Navarro Refinery, Control Station ENCLAVE, ENCLAVE Vault-Research Control... AccessDenied}"
    "{362}{}{Everything's shut down except for the ENCLAVE Vault-Research Control. I wonder what that is?}"
    "{370}{}{Accessing... Enclave Station Access denied.}"
    "{371}{}{Accessing... again... Enclave Station Access denied.}"
    "{372}{}{Accessing... yet again... persistent little cuss aren't you? ... Enclave Station Access denied.}"
    "{373}{}{Accessing... yet again... aren't you getting tired of this yet?... Enclave Station Access denied.}"
    "{374}{}{Accessing... yet again... don't you have anything better to do with your time?... Enclave Station Access denied.}"
    "{375}{}{That's it. I've had enough of this constant prodding. If you try just one more time, you're going to regret it.}"
    "{376}{}{Don't say I didn't warn you. (Just as you read this you feel a surge of electricity arcing through your fingers from the keyboard.)}"
  4. Tanker computer: "{105}{}{Welcome to PoseidoNet. This terminal is limited to transmission between one tanker - PMV Valdez - and docking rig. Command?}"
Enclave Symbol (Fallout 3).png
Enclave Symbol (Fallout 3).png