The timing is not good.
Just few weeks from Boramae's first flight and KM SAM blk 2 rumor. Do some people (or faction) in Korea try to erase Indonesia as their weapons market?
In modern ships it is usually a gastight boundary that enables personnel within to operate in a CBRN environment without special equipment. It is pressurised with filtered air and access is through air locks.
https://www.quora.com/What-is-a-citadel-on-a-ship