What he showed me is installing concrete piers that go deep into the ground.
The $70,000 question is whether my house will continue to sink. In 4 years its moved an estimated 5/8th of an inch at worst. When the house was finished new it wouldn't have been perfect, so I have no basis for comparison. It finish settling; it may get worse. I always thought sticky cracks and hairline doors were to be expected. I also think the concrete siding was weak to begin with.
I forgot to mention that the reason so much water had come into the basement is the drain for my sump pump was knocked off for some reason. The water was pooling right by the foundation enough for erosion to dig about a 1 foot hole. That night I spent about 30 minutes bailing out water from the side of my foundation. I have since filled it all in, covered the area with a big concrete drain, and made sure that pipe from the sump pump leading away from the house never falls off again. Not so much as a drop out of that crack and we've had 2 major precipitation events since.
If it did get worse, it would be smarter to repair the current damage, and sell at auction as is rather than spending half the value of the home making it right again.
I'm really thinking this guy is just a spook like so many other repairmen, hoping for a big score for an above average, but still normal settling house.
'85 500SL: Zippy 130k - '04 E320 4-matic 60k - '00 CLK 430 Sport 112k