Originally Posted by
cavekrazi
I think most folks call the loop in Roubidoux (RB, RBD, or the Roub) a tour of the top of the first drop-off area and the adjacent upper tunnel. This can be done without deco and only extends about 400 feet back. Any further penetration and you are at 140 foot of depth in the lower tunnel. The loop can be a nice 45-60 min swim in reasonable flow conditions. The lower tunnel is pretty much a trimix dive for me. The 3.5-4k estimate would put you at the "picnic loop". That's a little bit more of a swim. Might not want to try that without getting a little familiar with the cave. Best,t