I'm sorry, but I laughed so hard when i started reading this. I'm not saying it isn't possible... but wouldn't anyone laugh?
So anyways.... I think that one of us should take one for the team. We get a whole bunch of boats, and we will set sail to the ice wall. They will kill as all but hopefully before all of us dies, we can take a picture of all the guards sitting on the edge of the ice, stick it in a glass bottle, and then throw it out into the sea when the current is heading towards a continent.
So ya, all the people in the boat will die sadly, but one of us has to do it!
So, we then get a team of around 50,000 people searching the beaches of the continent for the picture in the glass bottle, and then we will take it to a photo expert to prove its a true expert (i'm sure there is an actual word for a "photo expert" ) and we will have proof, that there are Ice Wall Guards. =]