The mysterious cave is located south-southeast of Big MT north tunnel and southeast of Forbidden Zone dome entrance. It has nearly the same layout as broc flower cave, without the radioactive barrels and lit torches. It is west-northwest of Elijah's Watch.
Upon entering the cave, there are paths leading to the left and right. The left branch leads to a large chamber where the legendary bloatfly lives. Going right leads to a balcony overlooking the large chamber which offers a good perch to snipe the legendary bloatfly from. There is also a small cave offering a small amount of loot and a cot that can be slept in.
- Legendary bloatfly - Its body contains approximately 50 pieces of bloatfly meat, 20 Psycho, and 20 Buffout.
- 20 mutant cave fungus
- Scientist scrubs
- Scientist glove
PC Playstation 3 Xbox 360 The map marker on the compass may only appear when at the Forbidden Zone dome entrance, making it difficult to find the cave. [verified]