Remote underwater Cameras are video cameras that can be lowered into the water via a cable and transmit images to a topside receiver.  They generally have their own built-in light source, and provide a fairly decent image in clear water.  They can be very useful for checking “hits” obtained with magnetometer and sidescan sonar equipment.  The main problem with such cameras is the inability to control their direction or location precisely.  The currents present at the bottom, and the movements of the boat on the surface both make it difficult to position the camera as precisely as you would like to.  But, for a quick “peek” at an object to see if it’s a shipwreck or a natural formation, these cameras can be a real time saver, especially for targets over 100 feet deep.