Suppose you have been hired to mine a Manganese nodules off the bottom of the Pacific Ocean. Identify the problems you might have, and design equipment that would enable you to get the nodules to the surface.

The Deeper these nodules are, the harder it becomes. To use robotic submersibles eliminates the need for oxygen for people, but they would need an especially designed loader or mechanical "hands" to gather, and Balloons could Raise the mined Mn to the surface for collection.