There are a few likely causes for the horizontal cracks that lead to a basement wall bowing in.
Slightly bowed basement wall.
To install steel beam foundation support the floor along the foundation walls must.
Bowing or buckling basement walls rebuilding the foundation wall.
Remove as much of the covering as possible so that you can look at the whole wall.
Most basement foundation walls even if they are brick or block walls can be saved.
Most of the time a bowing wall is caused by hydrostatic pressure.
This pressure develops when the soil around your house is saturated with water.
If you notice any cracks in the wall then they will need your attention first.
Steel beam foundation reinforcement.
The soil expands and pushes against your foundation.
It is more common than you might think for a concrete block foundation wall to bow inward.
You might also notice that your basement walls are bowed.
Walls with severe structural damage will show additional horizontal cracks shearing.
The most common cause for foundation walls bowing in is saturated clay soils in the backfill.
The first thing you need to do is tear down anything that covers your basement wall so that you can examine the problem.
One is right after construction of the foundation the contractor could have put the dirt back around the basement walls too soon too fast or without properly bracing the walls first causing a hairline fracture.