Construction beginning/end
The survivors bring what remains of their ritual supplies to create a shrine by which to remember their friends.
Yet again the survivors feel that what they have done is not enough, and so they raid what meagre supplies that they have left, hidden away in a small storage cave, and construct a basic shrine at which to kneel and pray for their friends. This is also when they carve the first message in the wall; something more to remember them by, since they have no idea how long they will live and if they do perish it wouldn't be fair to leave the deceased anonymous to the future.