After the destruction of Mother Base, surviving soldiers of the Militaires Sans Frontières have some how got transported to an alternate universe. This nightmarish world is populated with crystalline zombie-like entities known simply as "creatures" and with no contact with the outside world, the Mother Base soldiers much fight for their own lives. Materials and debris from Mother Base can be salvaged and other survivors show up as the lost soldiers form their own fortress to defend and protect themselves from the "creatures" while trying to find a way to return to the outside world.
Did You Know?
The mother base shown on dite is supposed to be the mother base from the ending of ground zeros but it has the diamond dogs logo on it, at the time they were known as Militaires Sans Frontières. They didn't become diamond dogs untill 9 years later in the phantom pain. See more