One Got Banged in Zih

How was the noise from the pile driver?
Any pile driving experts out there? This layman wonders how concrete piles will withstand dozens (hundreds?) of strikes without cracking. We've often been serenaded in Zihua by locals using sledge hammers to break-up concrete. These Zihua pier piles, presumably, must be constructed of reinforced concrete.....

Didn’t hear a thing from the first one or the second one.