DaVinci Resolve as recommended above. Pinnacle Studio is a really amateur tool without the controls you need for UW video color correction and grading. The “purple” or Indigo Blue as I see it is not a bad dominant color and quiet pleasing to the eye really just the section around 02:40min mark that looked off but easily corrected in DVR.
GoPro is my personal recommendation for UW video - if not a high-end camera.
GoPro is my personal recommendation for UW video - if not a high-end camera.