Sometimes they are the only connection to caves or other subterranean features. The rock karstification facilitates the formation of subterranean drainage. Polycalic species of termites form multiple nests, or calies, connected by subterranean chambers. Cenotes are surface connections to subterranean water bodies. The roots are also aggressive enough to cause damage to subterranean sewers and pipes. They are known to be the most common archaebacteria in deep subterranean habitats. Syncaridans are mostly small and found in freshwater and subterranean habitats. All of these families contain lineages of subterranean or truffle fungi. It shows variations in fruit anatomy, leaf morphology and subterranean structures. They were subterranean, square or rectangular dwellings with wooden floors. There are 2,000 parking spaces in the subterranean parking garage. The plant produces two types of subterranean rhizomes. It is also a global biodiversity hotspot for subterranean fauna. Chinese giant salamanders are also known from subterranean rivers. There are many natural examples of subterranean rivers.