Wish we knew more about coral and salt water corrosion of aluminum vs. ferrous metallic items in such an environment. To me at least, it would help to know this. 
This aircraft has been in 125 feet of water in a coral atoll lagoon for 70 years. There is some corrosion in areas where dissimilar metals are joined and, for some reason, where oil was present. But otherwise the aluminum exhibits minimal corrosion and very little coral growth.
Which only underscores, IMO, that
IF we were seeing real Electra debris in these shots SOMETHING out of that pile would most likely be distinctive enough to be "KNOWN" - and not just some vague shape in the rock mist...With all due respect to the guys 'seeing' this stuff - Richie, Tim, etc. - I don't see it, nor do I think any of this stuff is 'Electra' at all. After months and months and now at least two significant strings I now believe I cannot take these strings seriously at all, no matter how sincere all this speculation is.
IMO now it is pure nonsense. It's not for a lack of desire or spirit - it's merely that wishful thinking seems to have stolen the day here.
No one will be happier than me if you all prove me wrong but I'd lay big odds against that now. The 'seers' here are simply rehashing much that has already been speculated on before - and 'readjusted' when 'scale' was pointed out to us - and off she continues to fly...
I can't take this seriously anymore and if this is what the Niku search is down to then it appears to me that the hypothesis is in trouble. IF that bird is at Niku it is going to take an awful lot more than this footage to find it.