Royal Australian Navy (RAN) Station 4 and Fort Skirmish

Royal Australian Navy (RAN) Station 4 co-ordinated the naval defences of Moreton Bay and also monitored anti-submarine indicator loops set between Woorim and Comboyuro Point (Bulwer) on Moreton Island, while Fort Skirmish was a two gun 155mm coastal battery at Woorim. Both sites were operational between 1942 and 1944.

RAN 4’s three surviving concrete buildings are located near the car park at the north end of North Street in Woorim. The concrete Control Post/Indicator Loop and Harbour Defence ASDIC (HDA) Control Hut is located southeast of the car park at the crest of the first sand dune. There are five main rooms plus two toilets, with entry from the west.

The single room northern concrete Engine Room is located in the undergrowth north of the car park, while the identical southern concrete Engine Room is located in a park opposite Eighth Avenue.

The only surviving element of Fort Skirmish is its northern Flank Observation Post (FOP), located next to the beach about 4.6km north of the car park next to RAN 4, accessible by 4WD with a beach permit. The FOP was originally positioned on tall timber stumps, but the concrete structure now rests on its side. Concrete footings are located nearby to the south.