Hot damn. Okay, so it's *juuuuuuust* barely, you are literally 55 feet away given where you're standing, but you DO actually ping an invisible door "north-ish" of you.
That is not to say the following room is 55' long; that is to say ORACLE by nature of the shape of the outer passage and where we already established folks are standing/acting, is 55' away from it.