We have a choice of a river:
...or a wetland:
The wetland has still water but the water in the river has better visibility, and moves very slowly anyway. Of the two, I think the wetland is a more secure site where the surface life support machinery for the habitats is less likely to be discovered.
I also now own a large enough lithium battery and set of solar panels to power the air compressor non-stop in perpetuity. I'm exploring some kickstarter funded portable water turbines as well, as a possible auxiliary source of current if I choose to emplace habitats in the river. More on that later.