'Deep' in the Bible

And in the middle of the day, Elijah made sport of them, saying, Give louder cries, for he is a god; he may be deep in thought, or he may have gone away for some purpose, or he may be on a journey, or by chance he is sleeping and has to be made awake.

And with the stones he made an altar to the name of the Lord; and he made a deep drain all round the altar, great enough to take two measures of seed.