nuclear Soviet sub

(your one of the crews in this submarine,after 1991 everybody though the Soviet union has collapsed completely,some submarine where scraped,nukes were lessen,territory lessen,the known empire is now the "Russian federation".but what they didn't know is that some Soviet subs are still operating and didn't surrender and hiding from NATO.the last soviets are now living in Antarctica with secret bases.while you guys where patrolling the waters,you guys encountered the Canadian HMCS margaret.)