Quicksand Fans

Can anyone point me in the direction of a scene I *think* I remember - it had a guy in a white shirt and an Navtive American looking woman either riding or walking through a marsh. The guy ends up in the quicksand - they are talking in a foreign language, Spanish I think. I believe he went under. I also think the movie was in Black and White. I would be interested in getting the name of the movie, or seeing the clip if it is available on YouTube or some other site.
Thanks for any help you can provide.

I've been trying to rediscover that one too... I think it may have been on one of Dave's classic quicksand clip tapes....