"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." - Sir Arthur Conan Doyle
And I can't think of a better Belle to enjoy such an investigation with than U-29. We have a strange series of supernatural circumstances and sailor superstitions made flesh regularly walk the decks of our warships. If such things are true, what else might be that we have previously discarded? Besides. The Morgana almost certainly have Naval bases somewhere. Whether it's in the Azores or Avalon doesn't really matter when it comes down to the brass tacks of finding them and killing them.
Excellent news about the battle engine. Not quite the level of fanfare and celebration Legate's "hint" had me expecting, but fantastic all the same. Here's hoping for some gameplay footage in the immediate future.