Thank you for the replies guys. Well I can assure you there is nothing to hide in there, but if I was the buyer I would want a look too. I'll probably wait for the actual inspection and see what they say. There about 15 foundation vents you can look through to see underneath the square addition, but yes there could be some dryrot in the middle not noticeable from outside. One last question.....Hausdok said to take a bore hammer from old crawl space to new one. Do you mean through the cement foundation?