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I would be a bit nervous about bringing all that expensive equipment in such close contact with water without further protection like a waterproof housing...
Thank you for your appreciation! As to the dangers of not having further protection, I guess that especially during the loading and unloading phases you have to be attentive: as long as the lens is not attached to a gimbal head, a lot can happen, and indeed the surface under water can at times be slippery. But once attached, I found it to be a rock solid solution.
Of course, it's best to check carefully that everything is securely fastened. I learned that the hard way a few years ago when I attached my D600 with a 17-35mm f/2.8 lens onto my tripod head, or so I thought. When I turned around, I saw, as if in slow motion, the combination fall to the ground and then spin down, straight into a pond. Since then, I tend to double-check the connections.
Incidentally, both the camera and the lens survived.