Looks like a SHANG class SSN (in North Sea Fleet?).
The new US Subs do not install a "cabin" (The DDS system) on top of their subs. They sometimes will install a mini-sub on top of the main sub to drive special forces to shore. But the spaces for the special forces on the new subs (Ohio SSGNs and Virginia SSNs, and the specially modified Jimmy Carter Sea Wolf SSN) are within the sub itself, and they use a vertical tube (in the case of the SSGN Ohios) or a 9-man lock in/lock out dive out compartment built into the sub. Now all of them can also also utilize the DDS (Dry Dock Shelter) which mounts to the top of the sub...but because of the impact to its underwater stealth, the newer boats usually do not deploy them.Unlike American submarines, Chinese submarines incorporate the cabin directly into their submarine instead of installing a capsule on top of it.