Note that this only works for objects that don't have any flexible parts and don't interact with the water in any other way than pushing it aside (e.g. soak water).
The same approach could be used with any liquids, and possibly gasses too. As a proof of concept, this is incredible. I can imagine a ton of applications too. Scanning fossils is the first that comes to mind. I'm sure there could be plenty of applications in forensics too.