While reading a forum I frequent (www.scubaboard.com) I came across an entry from a technical diver that was showing the risks of a controlled silt out. Long story short, people tend to under-estimate the potential dangers of silt, and just how quickly a scenario can become deadly. In this great demonstration the opening looks quite benign, and I can imagine would easily seduce a diver into its grasp.
Here is the video: http://vimeo.com/53944396
Here is a link to the blog:
Finally here is the link to the original forum post: