👉 The term "subaquean" is commonly used in the field of geology and oceanography to describe a body of water that lies below the surface, typically several hundred meters (m) deep. This term refers to the conditions at or below the Earth's surface where water is not able to dissolve minerals, and thus cannot be chemically dissolved into seawater. Subaqueous environments are characterized by an absence of oxygen, which can cause a wide range of health problems for organisms that inhabit them