Air tanks for use in scuba diving; Apparatus for recording, transmission, processing and reproduction of sound, images or data; Apparatus for transmission of communication; Audio speakers; Breathing apparatus for divers, namely, rebreathers; Buoyancy compensator jacket for use in scuba diving; Digital voice signal processors; Dive computers for underwater use; Electronic navigational and positioning apparatus and instruments; Loudspeakers with built in amplifiers; Microphones for communication devices; Portable and handheld digital electronic devices for recording, organizing, transmitting, manipulating, and reviewing text, data, image, and audio files; Radio transmitters and receivers; Regulators for use in scuba diving; Scuba diving masks; Sonar equipment and parts thereof; Transmitting and receiving apparatus for radio and television broadcasting and for long-distance transmission; Underwater breathing apparatus; Wireless communication devices for voice, data or image transmission; Wireless transmitters and receivers