My first instinct was to jump straight in. But with the depth sounder reading over 10m and no mask and no snorkel and no fins I figured my chances were pretty grim.
You need a different approach. Firstly, you find yourself some fellas who are willing to throw themselves into the river and go look for it.
You will also need a boat and a rough idea of where the needle was dropped into the haystack. In my case I dropped it right next to a mooring. Handy! Then they dive down and have a look around while you guard the boat. There is no specific time for how long they should be down there. I feel it should be at least long enough to make a goggle mark round their face.

Time ticks by and your optimism starts to wane. Then, a circle water a few meters from the boat starts to fizz. Your scuba heroes emerge with...
