Human beings have a primal, unshakable fear of the unknown. It’s
something that’s been hard-coded into us by evolution: back when we were
all living in the treetops, the dark places of the world held a whole
host of predators ready to tear us limb from limb; the deep night was
one of the most dangerous times of day. The most skilled, masterful
horror artists use this fear to great effect: the human imagination is,
after all, an incredibly powerful tool. In other words, the less you see of something, the more frightening it is.
That’s the whole basis of the virtual reality game "Deep Sea."