Part 15: Secret Level 03
Featured music - "Techno Industry" from the Descent II Redbook Soundtrack
Unlike the previous two secret levels, this one only has a single teleporter instead of two. There are only two enemies in this mine: omega defense spawn that drop bombs and thief bots.
Whenever you destroy the thief bot, another will spawn to take its place. Only one will ever be present in the mine, but they are a fucking headache nonetheless.