Thank you. You have established your authority by the obvious knowledge you display. I have only dad's discharge record, not as yet a full service record. Dad's place of work was off limits to civilians, and whilst at Toowoomba he functioned as a censor, so he was aware of the need to avoid disclosing information which potentialy could have assisted an enemy. I understand his quarters were located in tunnels, well removed from, but connected to the 6 inch magazines, and guns. He gave anecdotal evidence of the lookout who spotted the Nip sub, who was a patient. The gunfire clearly intended to sink the 'patrol boat' which burned in clear view of our Vaucluse home, came from Green Point & George's Head. Green Point was then Laings Point, and the boom was oversighted by these pieces. We assumed the burning patrol boat was considered some threat to the boom, although I suspect it was a pretext to practice firing at a very visible target. Cheers William Moppett