"You say you can drill holes in steel?"
This reminds me of the "tin-pecker" we had at our family shop.
One summer we started hearing this noise in the shop, braa-ta-tat-tat. . . braa-ta-tat-tat, like an air hammer on sheet metal.
We looked and looked for what was making the noise and thought it was one of the shop hands playing a joke.
But one day while outside I saw a wood pecker pecking on the tin roof. . braa-ta-tat-tat . . braa-ta-tat-tat . .
Mystery solved! But why would a wood pecker peck on sheet metal?
Well. . . the old wood rafters had borers and the wood pecker could hear them. Or so I've been told.
The "tin-pecker", just another shop sound.