...that these objects appear to be the same dimensions.
...evidence of the superframe nearby?
I'm not sure of this one, Hatch. But the angle pointed to by the red arrow looks suspiciously like the acute angles that are shown in the lightening holes in the Main Beam in the Harney drawings (which I can't reproduce here until Ric can post them).
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.
Hi AllI Believe the object with white lines on is some kind of hatch cover.On the left side you can make out L shaped hinge straps an if you look in middle you can see what appears to be handle lock catch.Also look at the right edge of object an below it how smooth it look'sThank's RichieO an check out the A shaped object underneath