You can hear the fear in the guy’s voice who is filming. Any kind of swim or mishap in this rapid would have dire consequence. As it is, the boater, Evan Moore, makes it through fine.
The 2017 near record snowpack in California has set up a summer river season with boaters running rapids at unprecedented levels. This section of the Kern River is called the Cataracts. For another view, check paddler Dane Jackson, who makes it look easy.