Centurion mod for Half-Life 2

Centurion is a multiplayer co-operative adventure, the follow up to Operation Echo Wave, it takes a new slant on the first episode's story. Dr. James Troy has escaped the Prison Base and has stowed away on a transporter to the Centurion Research Vessel in orbit. With such a dangerous and resourceful man endangering higher plans, it's up to the soldiers of the Prison Base to pursue and apprehend him. Five Dropships are in pursuit but on approach, your Dropship malfunctions and your team are pulled off course. The team are now marooned in the lower docking bay of the Centurion, one hundred decks away from the rest of the pursuit squads. One hundred decks of gloomy and terrifying uncertainty. This is no longer a chase for a man but a race for survival. Your team must reach Deck 1 where the main hangar is located, from where you'll be able to escape in another Dropship. You must work as a team to negotiate the hazards and vile lifeforms plaguing the doomed Research Vessel. Listen...