It's called a FORTRESS.
The near shore zone
It's called a FORTRESS.
A burrow. In a burrow there are underground rooms called warrens.
Hedgehogs live in dens which they dig underground, during hibernation they build a nest called a hibernaculum.
The animal that burrows underground to create its home is a mole.
Underground.
Underground water is called underground water, because it is "underground" not because it is fresh or salt. You can have underground salt water reservoirs just like you can have fresh water ones.
A rat's home is called a burrow. These underground tunnels provide shelter, protection, and a place for nesting. Rats are known to create complex burrow systems with multiple entrances and chambers.
A chipmunk's home is called a burrow. Burrows are underground tunnels that chipmunks dig to create a safe and cozy living space where they can nest, store food, and hibernate during winter months.
If its an underground reservoir for water, it could possibly be an Aquifer.
Its called an aquifer people
The underground stem of a club moss is called a rhizome. Rhizomes are horizontal, underground stems that produce roots and shoots to reproduce and spread.