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The basic problem of an underwater camera is the waterproof sealing - and you can see the extent to which Nikon has taken theirs with the large O-ring and flange around the lens. It's a tight , but smooth turn for the lens and certainly feels positive when it locks in.
There's also a double dose of it for the battery door and the card slot on one edge and the data attachment point on the other. Nikon have placed a diagrammatic tutorial into the menu of the camera that plays through half a dozen pictures to compel you to check the seals and to flush, blow, and brush off any contaminants before you open those doors. It's a decent-sized battery too - many of the other UW types use very slim batteries and carry a lot less capacity.

The control section is pretty standard, as is the ( surprising ) pop-up flash. I am assuming it is all as waterproof as they say on the box.
Results on the table? Better noise level, a little less DOF. Positive locking from the AF mechanism, and the use of an Aperture priority program was a little easier to implement than the last camera. I'd be prepared to declare it pretty much of a draw for my purposes, and in both cases would probably revert to the Fujifilm X series with short lenses.
Note the new additions to the motor pool - the Queen Mary trailer is going to have a crashed Curtiss Tomahawk fuselage dumped in it as soon as I can find an RAF Coles crane.