The term 'DIVER's Device' refers to two pieces of equipment used by divers: SCUBA and snorkel. SCUBA stands for Self-Contained Underwater Breathing Apparatus, which is a device that allows divers to breathe underwater. A snorkel is a tube that allows divers to breathe while their face is submerged in the water. Both of these devices are essential for divers to explore the depths of the ocean safely.