When Marcus Fenix
and Dom Santiago
are crossing the lake under Mount Kadar on a stolen locust
gunboat they are attacked by the Leviathan who kills the creatures pulling the ship. The Leviathan smashes it's tentacles down onto the deck of the ship one at the time, which are each attacked by Marcus and Dom. They are then able to get into the mouth of the Leviathan when it attempts to eat the ship and throw grenades at the beast's tongue, attempting to destroy it from the inside much like they did with the Riftworm. They repeat this process and the Leviathan is finally killed with Dom jokingly saying "Biggest fish I ever caught".