From the WIA, original post here.

Date : 13 / 03 / 2017 
Author : Jim Linton – VK3PC

To commemorate the RAAF No. 1 Flying Boat Repair and Service Depot 75th anniversary an Amateur Radio station VI3FB75 will be at Lake Boga, northwest Victoria.  Thomas VK3EO of Swan Hill and Noel VK3FI from Mildura, will supervise the operation on Saturday March 18, involving other radio amateurs from the Sunraysia Radio Group.  Any operator is welcome but prior contact with the organisers is recommended.

From an underground communications bunker the main frequencies will be primary 7.075 MHz and a secondary of 7.115 MHz, plus or minus QRM.  Operating time is 10am to 4pm (AEST) and maybe later depending on conditions.

A commemorative QSL card is available.  QSL information is via the bureau or a stamped self-addressed envelope care of VK3FI QTH(R) or qrz.com.  The WIA recommended the VI3FB75 callsign and the ACMA issued its licence.

The then WWII secret RAAF Repair and Service Depot had 416 aircraft land to be serviced, repaired, restored, rebuilt or overhauled.

The underground communications bunker has some original equipment, and photographs of it in operation.  Adjacent is a museum with a theatrette with narrated archival footage.

Further information is available via the following link.