ACLS65, if the tail was ever submerged any great distance, say on the bottom, it'd never come up. It's strength, as I understand it, is from its more or less honeycomb structure. The tremendous pressure deep underwater would mash the honeycomb and leave it looking like a ripply flat ghost of its former self.
Even at 100' the structure would begin to crack and take on water, a feature that would have shown in its attitude before it was picked up. And it would show as surface blemishes.
{^_^}