Sub-Mariner - The Depths (2009) (TPB)

Collects Sub-Mariner: The Depths #1-5.
Throughout the ages, a few men have wondered if this fabulous place actually exists. Fewer have imagined that the city is protected by a wild and vengeful being, the very embodiment of the untameable depths themselves - the Sub-Mariner! When a deep sea expedition mysteriously vanishes without a trace near the Marianes trench, legendary adventurer Randolph Stein embarks on a journey that will rock him - and his crew - to their very core!