Removing the viaduct takes some specialized machinery.  This one piece that was working near Pike Place Market had a couple of different attachments for the task.  The process of switching heads was interesting in itself.  A drilling head was used to punch holes through the deck of the viaduct and to remove the material from between the beams.  There was also a head that was a cutting jaw.  This would grab the side barriers and rip them from the structure.  It would crunch through sections and break them in to manageable sizes.  The effortless with which this seemingly solid structure was crunch into small pieces was intimidating!