My Apocalypse Leviathan

An extreme cold snap strikes, plunging the world into a frozen hell. Reborn, Zeke Shaw is prepared. He modifies The Leviathan, stocks up on supplies. In the apocalypse, he drives his vehicle, crushing marauders and making those who wronged him suffer. He rescues researchers and seeds, modifying an underground shelter to cultivate crops. With his vehicle, he fights through a desperate world, seeking revenge for his past life while protecting humanity's continuation.