Hmmm not necessarily though, our submarine dock or
dermaga kapal selam, both in surabaya and palu are atleast partially covered from optical spy satellites, plus the roof structure act as cantilever for the overhead crane (only in surabaya)
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although im not sure the recent condition of the Palu submarine dock after 2018 tsunamis, i think its poses no harm to the structures.
Even the nowaday Kriegsmarine (not Nazis) left the idea of enclosed submarine base and go full open without any coverage. Earlier Kriegsmarine, built these base, Saint-Nazaire U-Boote base
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THEY EVEN HAVE DRYDOCK FACILITY, HOW AWESOME.
and nowaday German Navy main submarine base, Eckenforde Submarine Base
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(even ours better than them....atleast..)
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funfact : damn so thicc
Natuna and Batam should also be built these structures. Or even better to have something like cave submarine base spread all over the country
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