If you are looking for a "helpful piece" to understand the episode better, Episode Overview: "The Abyss"
Critics and fans often cite "The Abyss" as one of the most visually stunning and emotionally taxing episodes of the final season. It serves as the "point of no return" for the protagonists, setting the stage for the series finale.
: Refers to the color depth; 10-bit video provides a wider range of colors and smoother gradients, reducing "banding" in dark scenes (which are frequent in this episode).