Before you start determine if the wall is a load bearing wall or not.
How to breaking through a concrete wall.
Scaffolding and safety gear.
Dig out the soil gravel or other material from under the concrete using a shovel and a pickax.
If it is supporting a roof ceiling or.
Seal the entire concrete wall with a waterproof masonry.
Dig under the concrete.
In compression it s very good hence most such fortifications involving prestressed concrete tensioners.
It can also develop small pinhole openings that act as capillaries for water transmission.
Concrete is horribly poor in strength when it comes to tension.
Matt b and ben h jack hammer out a cement wall in my shop jackhammered stright thru 8 inch soild concrete reinforced with concrete.
How to knock down a concrete wall prep work.
Pry off stubborn pieces.
Concrete is a porous material when fully cured.
Even so drop a 1 000 lb bomb with a 6 inch radius nose onto a hardened concrete structure and it will penetrate the structure.