An underwater town,that changed it name?

As the crd says... Hollbrook, the submarine town. I'm guessing it must rain a lot or they are close to the tide levels or something for the town to be sub marine.
this cardis from BakTrak, i think he was on his way home from the oz-Mega event.

they write...
Dear Pesky, we are travelling through Holbrook in southern NSW. Seems that a big sunami during the war blew several submarines ashore here. It was kept a secret and they even renamed the town to cover it up. I approached the official at the Scout sausage sizzle ( oh Poor scouts made into sausages) stall but he just grimmaced nervously and remained tight lipped.

What i still cant work out is what the town was once called...
thanks for the card.

A chinese Postacrd with a Brittish stamp.

The card from Zalgariath arrived today, quite an interesting combination...
A month old card, from China, rediscovered and posted from the UK, telling a tale of a sydney suburb!
Z writes.
G'day Pesky!
Had this bought from Beijing China a month ago for you!, Awesome city, come and find my cache!

I cant quite work out what the card is promoting but it soulds fun... integrate housing prices with moon Standards?
thanks for the card., I think. :)