Namor The First Mutant #3 (2010)

Continuing 'ROYAL BLOOD,' the epic storyline that propels Marvel's Avenging Son into a new world of horror! Namor takes the Curse of the Mutants deep undersea as he leads a fierce assault on the underwater vampires' eerie stronghold, far below the ocean floor. But as the First Mutant fights for his life, a dark secret from the past threatens Atlantis!