bowels

down in the bowels of the Earth

the project's bowels

Therefore in fierce tempest is he coming, / In thunder and in earthquake, like a Jove, / That, if requiring fail, he will compel; / And bids you, in the bowels of the Lord, / Deliver up the crown, and to take mercy / On the poor souls for whom this hungry war / Opens his vasty jaws

And David said to Abishai, and to all his servants, Behold, my son, which came forth of my bowels, seeketh my life: how much more now may this Benjamite do it?