Frenchmans for me too... Been there 3 times.
1st trip - my mate was in to his waist, and laughing about it... Autumn (Easter, early 90's).
2nd trip - between Christmas & new years, forget the year, maybe '92 or '93. Dry, maybe ankle deep if I was unlucky.
3rd trip, 2005. Had 25 or more kg's on my back, took a big step off a pad and went up to my knee. It wasn't that deep, but it was SOLID and I mean like concrete almost set...
I was really stuck, using all my effort with both arms and leg muscle to retrieve my leg from the mud.
I didn't think of it at the time, but if I had gone face down here, I reckon I would have been in a serious, serious bit of bother...
And my wife takes a photo.....

I walk with my plastic pants over the top...
A full inventory of the lower half is -
Scarpa SL boots with as much snow seal as they will take (applied with hair dryer), 2 pairs of explorer socks (one long pair to my knees folded down), jocks, long johns, a light pair of walking trousers, gaiters, and the plastic pants with rubber bands around the ankles.
My feet stayed dry the whole trip (except the swim across the Irenabyss)