Yankee Alpha Foxtrot Bravo

From the camo, I'm guessing that they're the periscopes of a U-boat, but I have no idea what they all do.
 

Good guess — they're the masts protruding from submarine HMAS Onslow's conning tower here in Sydney. From left to right: snorkel intake, ESM mast, radar, search periscope, and attack periscope.
 

Can you legally (and safely?) fly in Australia, given your training the U.S.? Is it possible and/or expensive?
 

As far as I know I can fly a US-registered plane in Australia (if I can find one to rent), and it used to be possible to do a BFR-like thing and get a temporary Australian license if you have a US license, which then allowed you to rent and fly normal Australian-registered planes (which is what I did a few years ago).

But all of that's now irrelevant in the face of the bizarre and draconian ASIC regulations that make nearly all GA pilots in Australia subject to pretty drastic security regulations in a lot of pointless circumstances, meaning that for all intents and purposes you can no longer just rent a plane and fly it -- you have to get an ASIC pass even to get on the ramp. And this is not really possible for visitors. AOPA Pilot or Flying covered the effects this has had some time ago, but I can't remember the details at the moment...
 

Can you provide a link to your blog entry when you flew in Australia a few years ago? Flying in Australia seems fascinating because of the sameness of the terrain. Before GPS, that must have been intense.