As one of those marine researchers... I gotta tell you, the main problem is not getting the computer waterproofed, but setting up a support system so that you can type. Think about it: gravity is a wonderful thing. Both for keeping the laptop there and for keeping _you_ there while you type. Realistically, we tend to create specialized single-function devices for diver operation. If it can be done with a single switch (magnetic, usually), that's the way we go. But, that's not to say that if someone offered me an underwater laptop, I wouldn't take it!
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As one of those marine researchers... I gotta tell you, the main problem is not getting the computer waterproofed, but setting up a support system so that you can type. Think about it: gravity is a wonderful thing. Both for keeping the laptop there and for keeping _you_ there while you type. Realistically, we tend to create specialized single-function devices for diver operation. If it can be done with a single switch (magnetic, usually), that's the way we go. But, that's not to say that if someone offered me an underwater laptop, I wouldn't take it!