this thing is in making at Pakistan navy dockyard since 2012
View attachment 389631
now at the end of 2016 this thing look like this
View attachment 389632
"The third submarine was fitted with the MESMA air-independent propulsion system. The MESMA AIP successfully completed Pakistan Navy acceptance trials. In March 2007, Pakistan placed an order with DCNS for the retrofit of the MESMA AIP to the first two Khalid Class submarines, which were delivered in December 2011."
http://www.naval-technology.com/projects/agosta/
PAKISTAN – Khalid Class Submarine: On 21 June 2011, AMI received information that the second of three MESMA Air Independent Propulsion (AIP) modules for the Pakistani Navy (PN) will be shipped from DCNS in the near term.
The MESMA AIP system will be installed in one of the two remaining Agosta 90B class submarines in Pakistani naval service during its next refit in 2012.
The likely candidate is the
PNS Khalid (S137), which was delivered to the PN in 1999 and is
entering its mid-life overhaul window in 2012, which would be the prime opportunity to install the 8.7 meter (28.4ft) plug.
The third AIP system is scheduled for delivery in 2014 and would be inserted in the PNS Saad (S 138) when it begins its first major overhaul. The third unit of the class, PNS Hazma (S 139) was built with its AIP plug already inserted. PNS Hazma entered service in 2008.
The mid-life refit and plug insertion will take place at the Karachi Shipyard and Engineering Works (KSEW) in Pakistan.
Additional information on this and other PN modernization efforts can be obtained by contacting Pat Bright at AMI International (Tel: + 1 360 373 2686 or E-mail:
pbright@amiinter.com) or visiting the Pakistani Modernization Report at
http://www.amiinter.com/wnpr/pakistan/modern.html.
If the first of two MESMA installations for the first two Khalid class submarines was delivered late 2011, then per 2012 the retrofit proces for the first of the pair that wasn't delivered with MESMA would start. Seeing as how the second MESMA set for retrofit would arrive in 2014. the retrofit of PNS Khalid would cover 2012-2014 and that of PNS Saad would cover 2014-2016. Which would explain why you see a docked submarine...