[Stalker of the deep]

I have been playing this game more or less since it came out and i have yet to see an ice berg or ice field this is probably because i dont spend as much time playing as i would like. I would like any info as to where i may find the above. i have serched the areas near reykjavik and north of russia but stil not found anything is this a seasonal occurance or is ther a place wherre i can find any?


thanks for the advice.