That would let me surface inside to do stuff like changing litter and resupplying food and water, allowing it to be truly permanent. The hamsters could live their entire lives down there happily for many generations, never needing to come to the surface.
It's sort of a waste that they're only using these enclosures for plants. Even one of those could house 100 hamsters, easily. The trick would be running power and air lines from shore to keep the inside warm, and the air breathable. Humidity would also be difficult to manage as it's open on the bottom, but I'm sure something could be worked out.
Another possibility would be to use the bubble as someplace to bring smaller habitats up into when I need to open them up and change the litter, resupply food and water, etc. so I could have a large number of individual smaller habitats, and the bubble as a dry space in which to service them without needing to bring them to the surface.