I personally don't own one of luxury camera but my son has one. He recommends this one.

Canon PowerShot D10 12.1 MP Waterproof Digital Camera with 3x Optical Image Stabilized Zoom and 2.5-inch LCD

If this camera is out of your buget, I recommend that you google it. You will see your resources.

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Nowadays you can get a very good waterproof case for just about any digital camera. First find out about one for the camera you have, they cost a fraction of the price of an underwater camera.