How to kill a leviathan in Helldivers 2

If you've dropped into Super Earth's harder difficulty defence maps in Helldivers 2, you'll likely have encountered the leviathan, a gigantic flying Illuminate battleship that smashes through skyscrapers and barrages you with cannons whenever you get close. It's a real nuisance when you're trying to complete objectives, but the good news is that you can kill a leviathan despite its seeming invulnerability.

There are a few different methods, but provided you've got a teammate to assist with reloading your support weapon...