With the help of Marbry Hardin, Forrest Wilson, Chris Garguilo, and Terry Hall, I managed to squeeze in a sump dive at Montague cave, right before rains that night sumped in the entire cave. The weird part? It is NOT going towards Russell Cave. The sump is at the top of the map (M1), with North oriented up. The passage is headed directly south. It seems instead of finding a passage towards Russel Cave, I ended up finding an unknown downstream passage that parallels the walking passage towards Widow's Creek and Campbell Spring.