Kayak trip gone wrong. (Testing my SONY action cam and losing it..)

I rediscovered my 6 year old SONY action cam and as it was designed to be waterproof I figured it would be cool to take it with me on my kayak trips. I thought I secured it well to the boat, but I guess not.. Well at least the camera was waterproof. I finally found it by wading through the water and using my feet to feel for it. The water is quite muddy so you can't see through. It was at a depth of about 1.5 meters as I could hardly stand there. I nearly found it at 16:45 but it actually took me another 1