Barely surviving Kuvira’s attack, Korra and her friends look for ways to take down the colossus. They discover that the exterior and joints of the behemoth mecha tank are made entirely of rarefied platinum and thus immune to metal bending. After paint bombs, lavabending, metal cables, collapsed buildings, Korra’s bending, and an electromagnetic pulse set up by Varrick all fail to stop the giant mecha for long, Lin frees Hiroshi Sato, who proposes to take the mecha down from the inside. Asami, Hiroshi, and the newly engaged Varrick and Zhu Li attach plasma torches to the two remaining flight suits, then engage the colossus. After Hiroshi sacrifices his life by allowing the mecha to crush his flight suit in order to gain enough time to cut open a hole to the interior of the colossus, Korra’s assault team is able to enter it.