 One only has to look at the "Severodvinsk", Russia’s version of a nuclear guided missile submarine (SSGN).I am so impressed with this ship that I had Carderock build a model from unclassified data.”

According to 60 Minutes, unnamed Pentagon officials claimed that Severodvinsk "slipped into the Atlantic Ocean and for weeks evaded all of the attempts to find her" in the summer 2018.Kazan was rumoured to be active, along with 5 other nuclear submarines in the northern Atlantic in Spring 2020.