Ephedra's Grotto in Moab

I have seen tons of guided tours to a place called Ephedra's Grotto near Moab. I would dig doing this short canyoneering trip with some friends. We are all at least intermediate and have experience so I don't really want to do the guided tour. Is there any information about trailhead or how to get to where I want to go?

AKA Medieval Chamber

summitpost.org/morning-glor…

It's the Incredible Handcrack of canyoneering. Just follow the crowds and get in line. Personally if I was visiting here I'd pick something cooler like going climbing or mtn biking.

Check out Rock of Ages, AKA Pool Arch Canyon. Better views, less crowds, bigger raps, and it's a loop hike so you don't have to shuttle.... There might still be a few pics of it on my profile page if you want to check it out.

EDIT: Granary Canyon can make for a fun day as well. Some of the raps can be a little awkward though, and you may have to build your own anchors so I would consider it a step up in difficulty from the previously mentioned canyons.