[ErroneousBosh]

> Dense multistory parking underground.

I sometimes forget there are parts of the world where you can go more than about a metre down without breaking out the Kango hammer.

[kijin]

Large parts of Seoul actually sit on very hard rock -- granite and gneiss from the Mesozoic era.

But if the only alternative to blasting the bedrock is to pay through your nose for prime real estate, blast the bedrock you will.