The Panasonic Lumix LX10 is arguably the best compact, point and shoot camera for underwater video on the market. It uses a whopping 20MP sensor and shoots beautiful 4K video that you could expect from a high-end mirrorless camera. The footage is sharp and detailed due to the high megapixel count for such a compact camera. The f-stop ranges offered by the built in 24-72mm (35mm equivalent) lens allow for beautiful bokeh as well.
The Sony RX100 VA, VI & VII cameras are the latest additions to the Sony RX100 series and are packed with lots of awesome features for underwater photography. They are the top of line compact cameras to date. Autofocus is lightning quick in both cameras, which is very beneficial for underwater application. Both feature a large 1" sensor with 20 MP resolution, which provides excellent image quality, fast autofocus, useful video modes (like slow motion) and full manual controls. The RX100 VI's key upgrade is its enhanced zoom using a 24-200 mm f/2.8 – 4.5 lens. The RX100 VA's key upgrade is 24fps sequential shooting, enhanced image buffer, and a customizable menu system. The RX100 VII has some minor improvments over the VI.
“As the Directors of Photography for Discovery Channel’s “Deadliest Catch” we have the responsibility to bring home high quality professional images that will be viewed by tens of millions of people worldwide. This is an awesome responsibility considering the incredibly harsh environment that we work in. All of our photographic systems are challenged by salt water, freezing spray, and violent collisions with hydraulic cranes and swinging crab pots – not to mention the times that we loose our footing and fall or get washed across the deck by waves. In this crazy environment our most reliable tool has always been the SplashCam” …more>
Then there's resolution and video quality. You'll want a camera that can record in 4K for sure. The top-end models from DJI and GoPro offer 60fps 4K with digital stabilization that's absolutely incredible. They're also not limited to ultra-wide views; you can set a narrower angle to remove lens distortion, making them solid choices for vlogging and travel logs.
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