On page 236 of the Discovery Documents, in small black ink letters, the dump sites of Bella, Celeste and Shan’ann are noted with small letters. B refers to the tank on the left, Bella’s tank. C is the tank to the right. Some distance away in a small patch of cleared earth is a squiggle representing the shallow grave of S – Shan’ann.
In the foreground at center a blue object may or may not be related to the crime scene.
That “squiggly line” is actually the letter “s” — for Shanann.
I take it you missed reading the title of this post.