Key Highlights:
- Ubisoft’s new Splinter Cell Blacklist walkthrough shows Sam Fisher and Isaac Briggs infiltrating the Sea Fort co-op mission.
- Sea Fort is one of Grim’s Fourth Echelon assignments and requires players to hack three stations without being detected.
- The mission demonstrates how Blacklist’s Ghost-focused co-op design depends on communication, timing and coordinated stealth.
Ubisoft has released a new co-op walkthrough for Splinter Cell Blacklist, showing Sam Fisher and Isaac Briggs infiltrating the Sea Fort mission off the English Channel.
The official Sea Fort co-op walkthrough features community developer Zack Cooper and lead co-op designer Richard Carrillo playing through Grim’s first Fourth Echelon mission.
Sea Fort tasks the pair with infiltrating an offshore installation, hacking three separate stations and escaping without being detected.
Unlike Blacklist’s more flexible campaign encounters, this Grim mission places much greater emphasis on remaining unseen. Carrillo explains during the walkthrough that enemies can be eliminated and their bodies hidden, but detection forces the players to restart the operation.
That makes communication particularly important. Sam and Briggs must coordinate movement, enemy takedowns and access to areas that are specifically designed around two-player interaction.
GLN previously covered the Splinter Cell Blacklist 101 trailer, which introduced the wider co-op structure alongside Ghost, Panther and Assault playstyles. Sea Fort now provides a more focused demonstration of what one of those cooperative missions actually demands.
From what I can see, the most interesting part of the footage is how strict the mission is about detection. Blacklist usually gives players room to move between stealth and open combat, but Sea Fort uses failure itself to reinforce Grim’s preference for clean infiltration.
Ubisoft says Blacklist will include four types of co-op missions spread across 14 maps, with Sam joined by CIA operative Isaac Briggs. Co-op is integrated into the wider Fourth Echelon structure through the Paladin and Strategic Mission Interface, with progression contributing towards weapons and equipment used elsewhere in the game.
Splinter Cell Blacklist launches on August 20 in North America, August 22 in Europe and August 23 in the UK for PC, PlayStation 3, Xbox 360 and Wii U.
Later update: Sea Fort remained part of Blacklist’s finished co-op offering, but the online side of the game did not remain permanently available. Ubisoft later retired Blacklist’s online services, with PC and Xbox 360 support ending on October 1, 2022 and PlayStation 3 and Wii U services having already closed in 2017.
Ubisoft now lists multiplayer and co-op as unavailable, meaning Sea Fort can no longer be played through the original online co-op services.
GLN later reported that Steam Achievements were added to Splinter Cell Blacklist in 2025, with online-only achievement requirements removed so full completion no longer depended on multiplayer functionality.
