I've been wondering about bow sidewalls.
Now we can, IMHO, assume that no one in the SLN has the
slightest idea that such a thing is possible. I believe that not even their few (their very few
) competent ONI analysts could speculate about the feasibility of it. I think that even if any SDF observers saw any evidence of bow sidewalls and included it in their reports, that part the report would have been deleted, as an obvious impossibility, before the report was passed on to the SLN ONI.
The MAlign, on the other hand, could possibly know about them, if those SDF observer reports did indeed include any mention of bow or stern sidewalls (granted that is a big "IF"). Because IMHO the MAlign would have done its very best to get copies of ALL of those SDF observer reports, the original unedited reports.