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The Moebius Skipjack and the Greg Sharpe plans for the Skipjack show 5 pair of ballast tank vents, 3 pair forward and 2 pair aft. Also, all the photos of the Skipjack subs I've seen show 5 pairs of vents. However, all references I have show that the Skipjack subs had 6 ballast tanks, 3 forward and 3 aft. So my question is: where is the missing aft pair of vents at? By studying the references I have, it appears that the missing vents may be for ballast tanks 4A and 4B, but I can't find any photos or anything else that shows more than the 5 pairs of vents. Does anyone happen to have any additional information that can enlighten me? Thanks very much for any help.