"Gate Keepers" is the sixth mission of Crysis 2.
Gould leads Alcatraz to the C.E.L.L. Nanotech Facility but finds it on lockdown. He suggests creating an explosive diversion to draw the C.E.L.L. troops away from the facility. Alcatraz then fights his way through C.E.L.L. operatives with every intention of detonating C.E.L.L. equipment to cause the C.E.L.L. to focus on his location. When Alcatraz is on his way to the C.E.L.L. Nanotech Facility, for the second time he meets the Ceph, he adjusts his Nanosuit 2 for the fight with Ceph and C.E.L.L. Assault Operative Alcatraz makes his way through the C.E.L.L. LGVs and C.E.L.L. soldiers to the building that leads to the Cathedral, where Alcatraz creates a special diversion for Nathan Gould to sneak in to the C.E.L.L. Nanotech Facility. Alcatraz disables security of the sewers beneath the Cathedral where he sights a most powerful version of Ceph, that can cloak. Alcatraz makes his way to the building we see in the opening for the chapter Second Chance while C.E.L.L. are checking the damage after explosions that Alcatraz have set off.
- Ceph Guardian Unit makes it's debut and is briefly seen at the end of level.
See: Gate Keepers/Gallery