The silver shadow on the right is a bucket. We use it to dig out that restriction and carry the rock further into the cave. This restriction is a little tight right now. When it is cleared out you can almost drive a scooter thru it.
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The fun thing is when the restriction is tight and the flow is howling. The gravel dances around like spaghetti in a pot. :)
I really enjoyed the video!
It doesn't help for long. People open it up and mother nature closes it down. It is just as easy to dig your way in and out. You only need it open wider if you are ferrying several stages in to go to the back of the cave.