Imagine all the planes crashed, and all the ships sunken...
I bet they will find more from time to time.
Sometimes even in good condition.

I should think the days of finding one in good condition is long gone.
To bury itself that deep in the mud, it had to hit the water at a tremendous rate of speed
All those that just settled to the bottom, fouled many a fishing net for years
And it's not unheard of, for a Professional Fisherman to drop heavy explosive charges to the bottom, to make sure he never loses another $4000 NET