Note that, because Latin doesn't have a definite article, it's rather difficult to convey the idea of "The Pit" (puteus can also just mean "pit" or "a pit", and in fact it has a more general meaning even than that -- it can refer to, for example, a well or cistern.)
If you're referring to the bottomless pit from Revelation 9 (which sounds likely from the context) it is called there puteus abyssi = "the pit of the abyss".