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dst2
It won't kill you but it'll be really fucking hard.
Where is it?
Basically if you've got a solid slab firmly connected to the ground it's really hard. You hit the top of the concrete with your heavy (but relatively smooth) hammer and all the engery goes through the concrete and is absorbed into the ground below and dispursed through the slab.
What you need is an 'in'.
So if you can dig out part of it to create a void then the energy can't flow to the ground in the same way. If you create fault lines, etc. then it fractures along those and breaks. Etc
Does that make sense?
Having a look and a think. Possibly drilling or digging bits in the right place will have it smashed to peices with ease.