Even with Zhou Tian's forgetfulness as outrageous as it is, there's no way he could forget such important matters. After all, magic crystals and magic cores are currently serving as energy sources. It is unheard of a ship that can sail far without fuel. Even if Zhou Tian had never anticipated the current situation, if it wasn't for the magic crystals in his possession, Zhou Tian would never have proposed using them as an energy source.
It can only be said that when Zhou Tian was making preparations earlier, he had underestimated the consumption of his ship.
