How Dutch submarines were sustained after occupation

How did the Dutch sustain their Pacific submarines after the Netherlands fell?

Through Allied adaptation and parts support, followed increasingly by a shift to maintainable Royal Navy boats.

Occupation severed the Dutch fleet from its industrial base, making unique machinery progressively harder to maintain. British and American workshops adapted components and manufactured some replacements. That support could extend a boat's service life but could not reproduce every specialized part indefinitely. Standard British submarines therefore offered a logistical solution as important as their combat characteristics.