'Treacherously hidden'
“Consider the subtleness of the sea; how its most dreaded creatures glide underwater, unapparent for the most part, and treacherously hidden beneath the loveliest tints of azure….Consider all this; and then turn to this green, gentle, and most docile earth; consider them both, the sea and the land; and do you not find a strange analogy to something in yourself?’’
— From Moby-Dick