When the tanks where empty and dry, one was disturbed, Not struck but rather slid on the ground. It rang like it was in resonance for a very long time. The ringing was abnormal and loud, as if it was a easily triggered tuning fork.
It reminded my dad of an old wheel that you use to go around with a peace of metal and it would ring, This is how he thought of it since he has seen such a wheel or bowl shap object in his past several times. He couldn't give me a name of what it was.
Either way, large quanitys of ss rings abnormally, this was determined during building these pans.
