Need 2nd crawlspace access point
I am in the process of selling my home. During the buyers whole house/termite inspection, it was noted that part of the crawl space was inaccessable due to a 18in high cinderblack retaining wall that runs the width of the crawlspace. The inaccessable part of the crawlspace can be visually inspected but there is no physical access point in order to do a physical examination of these parts of the crawlspace. There are only 3 options for making an access point 1) knock a few cinderblocks out to make an opening 2)create an opening from the exterior of the home (involves digging and removing of cinderblock) or 3) create an access point from above through hardwood flooring.
I am wondering if it is even feasible/warrented to do any of these options. What would the costs/risks of these alterations entail?
Any advice/suggestions would be highly appreciated.