Day One-fifty-four: Houston we have a problem?

In our quest to uncover the source of the mystery odor we may zeroing in on the source. We did more work tearing down the closet and other bulkheads in an area we want to clear out anyway and discovered a number of pieces with mold on them. We're fairly certain that the original owner did all this work and given that there are no obvious water sources (aside from the usual humidity of a basement) and that the mold hadn't spread everywhere in the years, it seems plausible that the owner used wood that was already moldy or damp because he had them on hand and didn't consider the consequences.

Unfortunately, in this quest we also took down the remaining panels on the cinder block walls and discovered a fairly deep (more than 6 inches in places) crack in the foundation. It's all along the mortar line between blocks, but there is a definite inward bow to the wall now. Our working hypothesis (until we can get a trained professional in to examine things) that they damaged the wall when they dug out the foundation for the addition in the mid-80s because this wall is directly underneath the wall in the house that leads into the addition. We should know more by the end of the week if this is something to lose sleep over.