STRINGS.SUBWORLDS.OIL.UTILITY
Though Oxygen is more scarce in this biome, it's the perfect place to cultivate flora and fauna that thrive in CO2, such as Slicksters. These critters can be domesticated as a renewable source of Crude Oil.
Diamond deposits can occasionally be found in the Oily biome, which will require a Duplicant with the Super-Duperhard Digging skill to explore properly.
Sporechids are beautiful, but should only be approached if a Duplicant is properly equipped.
While the dangers of this biome should not be underestimated, the benefits Crude Oil and Petroleum will bring to my colony far outweigh the risks.