Project Horus, a subgroup of the Amateur Radio Experimenters Group, has been doing high altitude ballooning since 2010. We attend launch number 60, celebrating 25 years of AREG - launching a balloon with numerous payloads, chasing and recovering it.

Thanks to AREG - check out their blog post at https://www.areg.org.au/archives/211683

Note regarding the phone call: it was actually to air traffic control, not CASA. CASA issues the permit, but ATC is notified when it's about to happen.

(something about the High Country? Next video... this one skipped the queue!)