The poseidon.zip file you have requested: The Outdated Abyss / Poseidon Class - 3.75mb is not available. Perhaps try browsing all files for the game Star Trek: Bridge Commander and upload any files you want to share or are missing. This is the only information we could locate:
Here is an intresting Sovereign/ Prometheus hybrid, The Poseidon Class. This ship hold up well in the game, and is nicely hardpointed. The Poseidon comes with (2) torpedo choices, Photons and Quantums. This ship is also heavely armored. But it's no match against a Borg vessel. This will be a intresting vessel to have in your Federation inventory.Defenately worth having a look at.