On Wed, 16 Mar 2005 09:30:46 -0000, "Tim Smith"
wrote:

I was reading with interest the thread about cheap SDS drills.

As others have contributed, a cheap SDS is unlikely to give you much
pleasure in this environment.

Depending upon the size of the concrete slab another possible option
would be to dig underneath if you can, then light a fire beneath.
That's how the attackers brought down castles in the good old days
before Black Adder I took place.....

Stand well back or shield with netting though - the concrete could
explode and spit a bit.

Andrew