A friend of mine asked me for some help and now I'm going to ask all of you for help too

He wants to model a vehicle (spacecraft) that has crashlanded and is now partially submerged in ice.
I remember seeing a dio of a tank that broke through the ice on a frozen river or lake or something. I can't seem to find it though. And I'm not sure that there was a description on how the modeler did the ice anyway.
So....do any of you good people out there have any suggestions on how to go about doing this?
Really appreciate any ideas you may have.
Thanks,
Craig