Final answer:
Inside a hyperbaric chamber, a diver should be in a lying down or sitting position to ensure safety and comfort and minimize physical movement.
Step-by-step explanation:
Inside a hyperbaric chamber, a diver should be in a lying down or sitting position. This is to minimize physical movement and ensure the safety and comfort of the diver. The chamber is pressurized, so the diver needs to be positioned in a way that prevents any potential injuries or complications. For example, in the US Navy training photos, the divers can be seen sitting on benches inside the chamber.