PoseidoNet

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.

In Fallout 76, the network is connected to Poseidon Energy Plant WV-06, as well as the Thunder Mountain power plant.

Facilities linked by PoseidoNet
Active in 2242: Offline in 2242: Others:
 * Control Station ENCLAVE
 * ENCLAVE Vault-Research Control
 * Navarro Refinery
 * Atomic Powerplant № 5
 * PMV Valdez
 * Iron Mountain
 * NORAD
 * SAC
 * HELIOS One
 * Poseidon Energy Plant WV-06
 * Thunder Mountain power plant

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