(W/A/CA) Matt Kindt. Six miles below the surface of the ocean* Mia has to solve a locked-room murder mystery before the crime scene is completely flooded. As the crew tries to save the Dept. H base from destruction* some of them start to take matters into their own hands. But the bottom of the ocean is full of unknown dangers* and with time running out* rescue is almost impossible. Collects issues #7-#12.