Could somebody explain this strange video showing a "frozen" jet of water ? Or might it be a fake ? (I wasn't able to source it; no idea what 'CRCN' stands for).
According to sciencealert.com the phenomenon responsible for the "frozen" stream of water is laminar flow, characterized by layers of fluid moving basically in parallel to each other, with very little cross-currents or turbulence. While that still does not definitively prove that the video wasn't faked (can't prove a negative) it provides a (IMO plausible) mechanism for what the video shows. There are other videos on YouTube that show pretty much the same thing. For reference, here's the Reddit thread where the GIF was originally posted.
Here is a video explaining this effect:
I have dealt with fluid extensively used as "mud" to pick up cuttings in well bores for drilling for oil and gas. It's a little more complicated than that and all kinds of liquids are used down to just plain water. It was done with all kinds of mixing applications and in all kinds of temperatures with extensive testing and visualizations of these fluids characteristics. If the hole in this video had a screen in it used as a filter of sorts and possibly even coned shaped or even if not and if cold enough it is very possible. With the break in the total column of water with a thin indistinguishable spray or layer at the outside would make it very possible if not probable. This effect would only allow it to happen for a short distance as mixing would eventually happen. As stated there is not enough information but taking this liberty of speculation makes it doable.