We designed the Hive so that the worms will be very well contained in the device and can not escape. That being said, they are still living beings and in some very unlikely case, it could happen that one or the other one finds its way out somehow. But don’t worry, unless they are a huge hoard, they won’t start breeding somewhere unwanted in your house and they are also not that hard to catch. They are all in all very lovely beings, relax!