I'm not sure how it would help to have any of you're questions answered. Whether or not you're going into a small (and possible) silty restriction is a judgement call. People have had accidents in tight restrictions before.... what might have been done to prevented a simple mistake escalating into a tragedy.
Unless you really know what you're doing you shouldn't try to get into really tight spaces, especially not when it's silty... that's what the - not new - lesson is but some people will still do it.