Here are entered works on the engineering aspects of equipment and techniques facilitating operations beneath the surface of the ocean in order to exploit its resources. General works on the application of engineering to ships and their machinery are entered under Marine engineering.
Here are entered works on masses of ice on oceans or other bodies of water that generally measure less than ten kilometers in their greatest dimension. Works on masses of ice resting on mountain regions and covering all but the highest peaks, or on bodies of water and measuring more than ten kilometers in their greatest dimension are entered under Ice fields.