Similarly, what happened to Surtur in Thor Ragnarok?
Surtur was successfully defeated by Odin who stole from him the source of his power, the Eternal Flame, before banishing him and his entire race to Muspelheim. After Odin went missing following the Second Dark Elf Conflict, a weakened Surtur intended to finally start Ragnarök, only to be defeated and killed by Thor.
Likewise, who destroyed Asgard in Thor Ragnarok? Surtur
Moreover, who kills surtur?
Surt (Old Norse Surtr, “Black,” presumably a reference to his charred appearance) is a fire giant who leads his kin into battle against the Aesir and Vanir gods during Ragnarok, the destruction of the cosmos. His particular fate is to kill the god Freyr and to be slain by him in turn.
Can surtur destroy the Tesseract?
Since Bor was definitely at par in terms of power with Surtur, we can safely conclude that: No, Surtur could not have destroyed the Space Stone. Tesseract Yes, Space Stone inside Tesseract No. Infinity Stones should be indestructibles.