................./ much more basic than you may think, especially compared to 'first' world standards and have been ongoing now in Asian waters at this lever for several years now.
Below is the barge with parts of Hr. Ms.0-16 (top tow images) and HIJMS Kuma (bottom) on-board. The same vessel also salvaged HIJMS Haguro which lays at approximately the same depths as did Java and De Ruyter. So pretty much a blow and grab operation.