Senku, Magma and Chrome explores a cave for tungsten, which they’ll need to make durable filaments for their cell phone vacuum tubes. But Magma has other plans in mind.
The rocks are hard as hell.
.الصخور صلبة للغاية
Die Steine sind allerdings irre hart.
Las rocas son muy duras.
Las rocas son muy duras.
Cette roche est archi dure,
E siccome è una roccia talmente dura 
da mandare fuori di testa,
Essas rochas são duras demais.
И камни невообразимо твёрдые.