If you'd like to use your Canon S330 for underwater photography, then you need this waterproof housing from Canon that's made specifically to fit the Digital Elph S330 camera.

The case offers access to all of the camera's controls and allows you to take underwater photos down to 100 feet (compared to the 20-30 feet most disposable "underwater" cameras offer).

I used this case with my S330 in the Bahamas and took several good photos. However, do be aware that the case doesn't provide for an external strobe of any sort (not that the S330 works with one anyway), which means you'll need good lighting to get decent photos.

I also do recommend very strictly following its instructions for use to prevent leaks, including testing out in a bucket or shallow water and immediately rinsing / cleaning the case after a swim or dive. I had no problems whatsoever after using the case on several dives in 20-30 feet of water.

This waterproof case works great! I took it to the Bahamas with me and took pictures of some fish while snorkeling. Not a single leak and the pictures came out great. Due to temperature changes, sometimes the pics come out a bit hazy, but utilizing the anti-fog helps. I recommend this if you enjoy a lot of water sports.

I purchased the WP-DC700 underwater case for my A70 and followed the directions exactly, oiling the gasket and cleaning it after each use. It leaked and ruined my month old camera. Customer service was rude, blamed me and then tried to bargain with me to fix it for $190 instead of the $280 that they initially requested. The underwater case has a 7 DAY WARANTY and the camera is not covered for water damage. My father had a similar problem with his $1000 Nikon digital which just stopped working for no aparent reason, they claimed it was water damage and tried to bargain with him to buy a rebuilt one for $500. So beware of bad customer service. Canon's customer service has all bad unreasolved reviews at the Better business Bureau