Plants:

* Roots: All plants have roots that grow underground to anchor them and absorb water and nutrients.

* Tubers: These are swollen underground stems that store food, like potatoes, yams, and cassava.

* Bulbs: These are underground storage organs with layers of fleshy leaves, like onions, garlic, and tulips.

* Corms: These are solid underground stems that store food, like gladiolus and crocus.

* Rhizomes: These are horizontal underground stems that can send up new shoots, like ginger and bamboo.

Other:

* Mushrooms and fungi: These grow in the soil and can form large networks of mycelium.

* Earthworms: These creatures burrow through the soil, aerating it and creating tunnels.

* Insects: Many insect larvae live in the soil, like grubs and ants.

* Microorganisms: Bacteria, fungi, and other microscopic life thrive in the soil, playing a vital role in decomposition and nutrient cycling.

More specific examples:

* Carrots

* Beets

* Sweet potatoes

* Turnips

* Radishes

* Mushrooms

* Truffles

* Earthworms

* Ants

* Beetles

* Microbes

This is just a small selection of what grows under the ground. There are many other fascinating things down there!