"Below" in nautical terms refers to any location, space, or movement situated on or into the lower decks, beneath the main deck, or inside the vessel's hull. It signifies being inside the cabin or lower compartments (e.g., "going below"), essential for navigating shipboard hierarchy, safety, and functionality.

Key aspects of "below" include: Location: Refers to the area under the top deck, such as cabins, holds, or machinery spaces.

Movement: Used to describe moving downward, such as "going below" into the cabin.

Context: While "above" denotes the exposed upper deck and rigging (aloft), "below" covers everything enclosed beneath it.