In the Known Issues List, it says there is a hole in the ice south of Zverolova Hill. I have found some other locations (3-5) but haven't been keeping a good track of them. I will start logging their locations here as I find them. I kind of like them but thought the devs may want to know.
- Along the southern rim of Podzemnyy Mir Gateway - about (-11248.426, -5646.255)