User blog comment:BlackF0xtheorist/Precursor Appearance in the Arctic DLC/@comment-29172324-20180405214152

1. The Gargantuan Leviathan went extinct 3 milllion years ago, long before the precursors came to the planet.

2. The precursors have uploaded their minds into a "cloud" the rest most likely died from kharaa. The ones in this cloud no longer have real bodies, as they have been destoryed, So bascialy the ones in the cloud cant be seen as well