“If there’s anything left of that Marconi set but a pile of rusticles,”
No rust at that depth. I guess you have missed all the artifacts recovered after more than 80 years underwater in almost perfect condition.
I guess you must have missed all the articles about the Titanic’s hull being draped in what salvagers have termed “rusticles,” which are huge “drippings” of rust that run down the sides of the wreck.