seabed*

The seabed refers to the deepest part of the earth’s substratum beneath the oceans and seas. They constitute a geological expanse, encompassing various types of landforms[i] and are home to a variety of ecosystems. The seabed harbors considerable deposits and strategic natural resources, such as nickel, copper, manganese and cobalt.
[i] Continental shelf; Abyssal plains; Mid- Ocean ridges and Oceanic trenches.