Very nice synopsis, Sonicfire1981. One thing to remember about OM & Dark Waters (built on OM) is that a player does not / cannot progress through the boats (no boat upgrades), except for an opportunity to "upgrade" to the Type XXI or XXIII (??). KaleunMarco would have to comment on his experiences there, having been in a Type IIB in the Black Sea when he was upgraded just before the end of the campaign, and then "abandoned" by the BdU... a rather strange occurrence with no plausible explanation as to how the new boat got to the Black Sea...
- equipment upgrades work fine, but the turm upgrades also present problems, though there is a "work-around" of sorts.