Flashes of half seen things through cracks in space play through Langdon's mind as he sees the ocean. Vast, deep, endless. Is this being from another world? Is it the incarnation of such a place? Is the ocean a metaphor for something even an Awakened mage can't comprehend? All valid questions and ones that Langdon regretably has to push aside for now.
"Our.. host is something I can't really describe. Vast, deep, an ocean. Or something like it." The Stalker nods to their host. "Apologies, the protections your Master had placed on this location are fading. We found the entrance to this sanctum and decided to see what it was." Caution is the watchword Langdon feels right now.