The Russian Navy's new submarine mothership, Podmoskovye, set sail for the first time on 22 October 2016 to under go on sea trials following a lengthy conversion. Podmoskovye was originally the Project 667BDRM-class ('Delta Ⅳ) nuclear-powered ballistic missile submarine (SSBN) K-64, launched in 1986. It has now been converted to act as a mothership for the smaller special-purpose Project 10831-class (Losharik) and Project 1851-class (Paltus) submarines for underwater research and intelligence-gathering activities.
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