Open circuit scuba equipment is occasionally used by commercial divers working on sites where surface supplied equipment is unsuitable, such as around raised structures like a water tower, or in remote locations where it is necessary to carry equipment to the dive site. Normally, for comfort and for practicality, a full face mask such as those manufactured by Kirby Morgan will be used to allow dive lights and video cameras to be mounted on the mask. The benefit of full-face masks is that they can normally also be used with surface supplied equipment, removing the need for the diver or the company to have two sets of expensive equipment.