Hi There!
Here are some more images from the arctic environment. For the fog I used a large direct light with volume effect and a noise projection map. For the sea I used a blend material of foam and ocean lume, using an ambient occlusion map with a low sample rate, high spread and a blur as the mask so that objects in the sea would have foam around them, I think it really adds to the cold feel of the environment. Please feel free to comment.

Edit: The finished flythrough. The idea with this is that the camera would hold on each vehicle before flying to the next one, hence it slows down and accelerates between each them.