 Well, it's 200 feet thick in some places. Where we were at on the eastern plateau, it was anywhere between 60 to 100 feet deep. That's a lot of ice because you can't simply just go up there and search around like you would in the Rocky Mountains. It doesn't work that way. You have to actually get up there and then you have to use scientific equipment like GPR, ground penetrating radar, to try to peer under the ice. We used other technology like satellites.