The idea is that a cave opened, and huge (3-5m?) beetles were unearthed and disturbed, causing an attack on a town. They have extremely tough shells that are resistant to most hazardous substances (acid, poison, etc), and reproduce asexually by laying eggs with replicas of their own DNA, effectively cloning themselves. They are also extremely strong. However, they are very docile when undisturbed and fed, and since they are too large to take in oxygen through diffusion through the skin of the insect, they have canals through which they push air, like gills for air instead of water. This makes them susceptible to anything airborne.
I feel it might not be well received, as there may be too many large, deadly beasts already present as SCPs.
Thoughts?