Thank you Herzeleid for the info.
It never ceases to amaze me the breadth and depth (pun intended) of the knowledge base of this awesome extended Community that I get to be a part of. The mere thought that two Members here were able to recognize the really obscure film this scene came from (wait, obscure Russian film, no less) and post that film's title and synopsis here on this Board for all to read less than 12 hours after I posted the clip is nothing short of amazing. That one of you folks actually own a DVD copy of the film and can highly recommend it is by any standard measurement, absolutely off the charts.
Over the years, I have viewed literally tens of thousands of photo images, vidcaps, film clips and full videos depicting q/s and mud and the folks who land themselves at various depths into theses non-Newtonian substances. I recognize that it is highly unlikely (actually, nigh on impossible) that "little old me" is going to locate and post some obscure clip or photo that none of our Membership has ever seen, but I do hold out hope. I had thought that yesterday's post contained just such a clip.
Many thanks again to Boggy Man and Herzeleid for reminding me once again of the awesome power of the internet and for knocking me down a couple of pegs. A little humility is a good thing.
Still, the mud in that scene was really cool, wasn't it?