Part 43: Vertigo Secret 02
Featured music - "Untitled (Extended)" from the Descent II: the Infinite Abyss Redbook Soundtrack.
GOTH-9 is a very green and dark secret level. There's not a lot of danger in this mine, but do be careful when you play it because there are some dangers. This is also the first chance to get an earthshaker missile. Unlike in the original game, it is actually pretty necessary to hoard these as there are fewer of them in Vertigo to find (even though I was hoarding them before because I didn't know that more than ten could be carried).