This and this, before it enters the mouth of the shuttlebay and while it's in the mouth.
Also take account that the vengance is pitched forwards so the gap between the front of saucer to the waterfront would be greater than if the ship was level.
The Vengeance wasn't pitched forward that much, just enough for the front of the saucer to be slightly submerged. Someone could draw an outline of th saucer and curve it back around.
Here is the video, fast forward to the end and you'll see a shadow and if you still claim not to see one then something is up because there is a shadow on top of the shuttle as it enters the now smaller bay. I don't know about something called astris something, what is that?