After tunneling over 1,000 feet since starting work in August, an obstruction is blocking the path of Bertha, the tunnel-boring machine currently digging a highway underneath downtown Seattle. No one is exactly sure what is in the way, but engineers are working to solve the mystery. Wells from above ground will pump out groundwater to make conditions in front of the TBM safe for workers to enter and find out what the problem is. In the meantime, residents are having fun with the matter and recently tried to guess what could be blocking Bertha’s way. One TV station made its own suggestion as to what the obstruction could be in an appeal to Seahawks fans.