Gopro and most other action cams not the best for underwater. My Olympus TG-2 (TG-3 is current model) works very well, and has lots of great reviews.
I have used various action cams with my plane, incl the Gopro Black 3+. While Gopro is the most popular, it has some real limitations. It is very poor with dynamic range, and hard to get consistent good footage. Can get some very good short clips, but requires a lot of editing and post production.
Sony is much better with the dynamic range and has better color than the gopros. I use their Action Cam Mini (their latest offering) and have their newest 4K one (FDR-X1000V) on order.
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