It's possible that the Question Mark is some kind of sea creature, but it seems the wrong shape to be a whale--they're not quite so long and thin. Since it looked like a snake, it could be an enormous sea serpent. There could well be sea serpents in the Snicket-world; we've seen some pretty unusual creatures in past books, such as the cathedral-toad and the Lachrymose Leeches. And VFD trains reptiles, so they could have attempted to train a sea serpent that communicates by sonar for use in underwater missions. We're free to speculate on the matter of the Question Mark, since Lemony actually says that he won't tell us what it is.
It could be possible it is the 'Bombinating Beast' from 'Who Could that be at this hour?' which Moxie tells Lemony was slain by Lady Mallahan, perhaps it's a descendant of the beast, or a variant of the same species. Or perhaps if it is a submarine it was built to look like the Bombinating Beast perhaps it's creator knew much about it. (Images) The Bombinating Beast and, The Great Unknown
Last Edit: Jul 22, 2016 6:17:11 GMT -5 by LeoAGloe7