OK, I can.
I saw a 76 foot Lazzara at the factory yard being reworked after it hit a
submerged container in, as I recall, broad daylight.
Is that good enough for you?
We frequently have objects that we do not see strike the hull in the
Dismal Swamp canal. Sometimes they hit around the bow and we can hear
them roll back to the stern. Sometimes they even set off the depth
sounder. Never have been able to see any of them. I've always
contended that they were dead bodies, but I suppose they would
eventually float up to the surface if they were.