re: Crackpot ASOIAF Theories SPOILERS

I think they are looking for an entrance for Stannis' men into Winterfell. The Battle of Winterfell will not be a battle at all-it will be a slaughter just as Ramsay had when he betrayed Theon & Ser Rodrik. The Freys will fall into the ice and Stannis' men will be led into Winterfell under the crypts where they will massacre Bolton troops along with the Umbers, Ryswell, Cerwyen, Manderly, etc. troops.