List 3 areas of the body or pieces of equipment that are subject to barotrauma.

Barotrauma occurs when there is a pressure difference between the inside of a body part or equipment and the external environment, often experienced during diving. In this context, the correct answer highlights three areas that are particularly vulnerable to barotrauma: the mask, ears, and sinuses.

The ears are highly susceptible to pressure changes due to their anatomical structure. During descent, pressure increases and the air in the middle ear must equalize with the surrounding water pressure; failure to do so can result in discomfort or injury.

The sinuses are also at risk because they are air-filled spaces that can become subjected to significant pressure differences, particularly if a diver cannot equalize properly. This can lead to painful conditions known as sinus barotrauma.

The mask, while generally considered a piece of equipment, interacts directly with the diver's face and is designed to allow for air pressure equalization. A full-face mask in particular can create complications if pressure differences are not managed properly.

These areas are crucial for divers to monitor in order to prevent barotrauma, making this answer especially relevant to the physiological considerations and safety required in diving practices.