As I understand this, the topic is Possible Rope Video which has now evolved to an antenna or control cable.
Yes, the topic is Possible Rope Video. Other possibilities are being discussed. Nothing wrong with that.
My research has concluded that in 1937 antennas were generally copper clad steel. Two dissimilar metals. Were it this type of antenna, galvanic corrosion would have reduced it to nothing in the past 75 years. If it is a control cable, the same would apply due to being in an electrolytic (salt water) environment for that long. Given that, there would be no need to look further for any hardware that connected either as none would be found in the debris field.
Invalid. Unsupported speculation stated as fact.
As witnessed by the little that is left of the Norwich City after 83 years a mostly steel ship, rust and corrosion has reduced it to a mere skeleton. A mostly aluminum airplane with many dissimilar parts would likely be reduced to almost nothing due to galvanic/electrolytic corrosion.
Nonsense. There are dozens of examples of aluminum aircraft submerged in salt water for similar periods that survive in good condition.
And to my knowledge there were no zinc anodes attached to the Electra that would have protected it for very long if there were any. Those would have been eaten up in a very short period of time anyway. There are eight different types of corrosion in a salt water environment, (too much to define here) most if not all would fatally destroy any fasteners on control cables or antennas. It is however possible that chromium plated stainless steel fasteners could have survived but those came along after 1937 as far as I know and could show some deleterious effects.
This kind of opinion stated as fact is not helpful and I'm letting this posting stand only as an example of what not to do. If you have research that supports your opinion, cite your sources.
For example, if you want to argue against the survival of antenna wire you could point out that the TBD-1 Devastator - a design contemporary with the Electra - had a wire antenna that went from a mast in front of the cockpit to the top of the vertical fin. The TBD-1s in Jaluit lagoon - one at 50 feet, the other at 125 feet - have been there for 70 years. No antenna appears to be present on either aircraft.