What happens when worms die?

Hereof, why did all my worms die?

Air circulation – Air circulation is a common cause of compost worms dying in their bin. Even if your bin came with plenty of pre-drilled air holes, they can become plugged, causing oxygen starvation. Too little food may lead to your worms eating their own castings, which are poisonous to them.

One may also ask, do worms play dead? Amynthas hupeiensis will coil but remain motionless when disturbed, unlike most other pheretimoids, and it emits quite a strong odour. So yes, perhaps it is playing possum.

In this way, will worms eat dead worms?

That's a taboo, worms don't like to talk about it. Seriously though, they seem to decompose very fast. Way faster than most of the food scraps in the bin. So we don't "see" (at least I don't) worms eating dead worms, because the latter are already unrecognizable as worms.

How long can a worm survive if it gets cut in half?

If an earthworm is split in two, it will not become two new worms. The head of the worm may survive and regenerate its tail if the animal is cut behind the clitellum. But the original tail of the worm will not be able to grow a new head (or the rest of its vital organs), and will instead die.