Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
For the player who explores to the edges of the tutorial's fifth map, they will discover two black-painted laser turrets, and a steel chest that contains 21 defender capsules and 15 more laser turrets to use elsewhere on the map to defend other parts of their factory.