I’d expect many sharp surfaces too, but it’s probably safer than the fine layer of regolith on the lunar surface. Those are small particles with very rough edge

I’d expect many sharp surfaces too, but it’s probably safer than the fine layer of regolith on the lunar surface. Those are small particles with very rough edges because there’s no erosion from weather. Like any lung irritant it’s quite hazardous to be exposed to. The idea is not to just go in there though, it’s to put a structure there (inflatable is often proposed). This could be more feasible than building something on the surface where the environment is harsher. By the way there’s lots of seismic activity on the moon.