My bathroom was an addition sometime before I bought my house and extends past the basement foundation.

They seem to have sacrificed a hopper window and left the casement intact as access. This was apparently before child labor laws, because I ain't fitting through this opening. (I probably could but then I'd realize I forgot a tool and hate my life)

I anticipate that I will need to at some point - if I want to move some plumbing or add some wiring.

I want to cut where the blue line is. You can see there is not dirt behind it and the window sits up at the level of the sill plate already.

I think I can just cut two blocks in half with a masonry grinder blade and remove 3 blocks.

Roast me.

https://imgur.com/a/okX7Iio