Pygmy Hippo Habitat with underwater viewing

This may not be the right place, but does anyone know a way to do a full-sized underwater viewing area? Something on the order of 100 square meters with a glass roof? Thinking of doing this for a massive hippo lagoon, but I haven't found any glass roof pieces strong enough to support water above them. I have a backup concept for the exhibit, but its a concept I've already used and I prefer each major exhibit to be unique.

Also, is a massive underwater viewing area even a good idea for hippos? I've heard they spend much more time than they should out of the water. Thanks!
 
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