This is a interesting site.
The air battles that took place over PNG during WW2 , are somewhat overlooked and forgotten about in the general scheme of things today.
http://www.pacificwrecks.com/history/salvage/
I met a WW2 Japanese aircraft historian , a VMVC member, at the first club meeting I attended in 1976. He had travelled to places like Rabaul in the mid 1960's , photographing many Jap aircraft wrecks around the islands.