Function well - life miserable

I have the red filter used to my Gopro 3 in the current diving holiday. With regard to the appearance of the filter does the job. In the range below 5 meters, the colors will be adjusted accordingly and there are wonderful shots.

Unfortunately, the manufacturer has saved despite the high price on the thickness of the gas disk. After 3 days of diving, the first cracks in the corners of the frame could be seen and after the last day (5) Been large cracks across the entire filter, so I had to dispose of these.

I already use several cameras with appropriate filters touchdown. So far, however, is never a filter broken. If this happens after only 3 days, the material chosen has missed its purpose. Since helping the manufacturer's instructions that this is a pane of glass also is not ....