The MV club here have visited the HMAS Castlemaine a few times over the years. Back in the 1980s they had a ham radio station onboard , I have a QSL card somewhere, the operator was a lovely ex-WRAN who I met , she was excellent on the Morse key.
Interesting reading the technical stuff on the two engines fitted in these vessels ( the engines fitted in the Castlemaine were built in Castlemaine, Victoria ) , the sealed engine room was kept at slightly above the normal atmospheric pressure, this was done so that the engines would breath and perform more effectively, one wonders how the poor stokers coped with this as well as the tropical heat , must have been hell.
https://hmascastlemaine.org.au/propulsion.php
Jeep and HMAS Castelmaine
https://www.awm.gov.au/collection/C46539