The last of six remaining Russian Typhoon class ballistic missile submarines (SSBNs) was deactivated over a year ago.
The Typhoon class SSBNs were an innovative design, with no fewer than five pressure hulls contained within the outer hull. Two of those pressure hulls were full-length and skinny, with the missile tubes positioned between them forward. One pressure hull was the largest diameter one and formed the foundation for the sail. Small submarine escape pods were carried on either side of the sail. Smaller inner hulls were at bow and stern.
The Typhoon class had a submerged displacement of 48,000 tons -- by far the largest submarines ever built.
The last photo shows the missile tubes open on two boats at a pier.
https://en.wikipedia.org/wiki/Typhoon-class_submarine