Novaray Underwater ROV
Underwater ROV (Remotely Operated Vehicle) Operates in high currents - maritime search and rescue, maritime port and ship security, underwater treasure salvage. All in one underwater rov
http://www.novaray.com

Lubell Labs Inc.
Lubell Labs offers underwater speakers, underwater loudspeakers, underwater acoustic transducers, diver recall systems, synchronized swimming sound systems, amplifiers, analog and digital recorders, wired and wireless microphones, sound reproduction equipment, and complete air and underwater sound systems.
http://www.lubell.com/

Simon Fraser University
Underwater Research Laboratory (URL). Specializes in underwater studies in the areas of acoustics, sonar, autonomous underwater vehicles, column surveys, signal processing and target detection. Page lists projects and personnel.
http://www.ensc.sfu.ca/research/url/

Sub Sea Sonics
Underwater acoustic release, underwater timed release, manufactured by Sub Sea Sonics for the marine industry.
http://www.subseasonics.com/

Carrillo Underwater Systems
Manufactures underwater lights, cameras, and diver "squak boxes". Specializes in low voltage underwater video, helmets, and navigation lights for commercial and recreational divers.
http://www.carrillounderwater.com/

Commercial Diving Academy
The Commercial Diving Academy prepares you for work as a Diver, Underwater Welder and Dive Medic. Train in Underwater Construction, Search & Recovery, Non-Destructive Testing, Inland Diving, ROVs
http://www.commercialdivingacademy.com/

Nautilus Underwater Systems
Provides SCUBA gear and accessories, onboard tank fill systems, medical supplies, underwater vehicles and training programs for yacht-based use in underwater exploration and recreation. Includes product descriptions and photos. Located in Fort Lauderdale, Florida, USA.
http://web.mac.com/nus2/NUS/

AUVSI Autonomous Underwater Vehicle Competition
The industry's leading resource for unmanned systems information.
http://www.auvsi.org/competitions/water.cfm

Underwater Recordings
Dolphin and whale sounds recorded with Cetacean Research (tm) hydrophones.
http://www.cetaceanresearch.com/sounds/

Underwater Photography - Aquatic Images by Robert Darmanin
Underwater photography tips and techniques, including tutorials and information on how to take great pictures underwater.
http://aquaticimages.com/