Here's why:

* Stable Molecules: Clathrates are stable structures where guest molecules are trapped within a cage-like framework of host molecules.

* Carbon: The host molecules in clathrates are often composed of carbon, forming structures like methane clathrates (where methane is trapped within a water ice cage).

* Below Sea Level: Clathrates are often found in deep ocean sediments, below sea level.

* Low Temperatures & High Pressure: The conditions needed for clathrate formation are typically cold temperatures and high pressures, which are found in the deep ocean.

Example: Methane clathrates are a common example, where methane gas is trapped within a crystalline lattice of water molecules. These clathrates are found in vast deposits on the ocean floor and are considered a potential source of energy.