Tripods

So I have two underwater water cameras. They are really cheap and they float...

Does anyone know of a heavy tripod or other tricks that I can use to make them sink and/or stand up on the steps?

I have been trying to look around and I am not quite sure what to search for.

Have you seen the tripod you can get with the suckers on. You can get them on ebay

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You can add diving weights (0.5kg should be enough to make a small camera sink). How to mount it depends on your camera and the type of the weight (soft/hard).