Pakistan has recently carried out expansion activity at its kirthar Deep storage underground facility which includes building new portals. These 4 new portals increase the total portal count at the site from 3 to 7.
Kirthar has been previously been featured in 2017 in a report by the Institute of science and international studies. The facility lies 31km away from a suspected missile base in khuzdar that possibly holds Shaheen-2 launchers
The four new entrance portals which seem to be excavated in 2018 at the site give the forces more redundancy and also make it more difficult for an adversary to shut down all the exits in the event of a strike.
Hardened structures similar to those seen at other suspected storage sites have been built on the portals. Two structures were seen to be under construction in planet labs imagery from may. These structures have at least 4-5 of reinforcements and are also likely concrete reinforced in the inside which makes them very survivable and hard to destroy.
This expansion activity seems to be a part of a larger pattern of older facilities being upgraded and new ones being built which has been observed all over pakistan.