Underground Cave is an underground sub-area in the Frontier Legends DLC for Bloons TD 6. It is a large cavern located underneath Sulfur Springs filled with Bananite crystals guarded by Bloons. Bloonarius can be found in the innermost part of the cave. In the story, Sheriff, Scout, and Hazel track the Bloons to this location and find a non-natural tunnel, which makes Sheriff worry and decides to go back to Sandytown to inform Mr Mayor about their findings.
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