The vagal response is an automatic reflex that happens within your body when your vagas nerve is stimulated. This reflex affects your central and peripheral nervous system, as well as your cardiovascular system and therefore a sudden stimulation of this reflex can set off a variety of symptoms.
Deep sea zones. The deep sea or deep layer is the lowest layer in the ocean, existing below the thermocline and above the seabed, at a depth of 1000 fathoms (1800 m) or more. Little or no light penetrates this part of the ocean, and most of the organisms that live there rely for subsistence on falling organic matter produced in the photic zone.
Understanding Ocean Zones: The Sunlight Zone. This ocean zone is from the surface of the sea down to a depth of about 200 meters. As you begin your descent you see that the ocean is absolutely teeming with life forms of every sort. From the microscopic plankton and diatoms that give the ocean its murky color and limits visibility, to bony fishes of every shape and size, to starfishes, and warm-blooded, oxygen-breathing mammals.