Capable of reaching nearly 500 feet deep, the Titan is an ideal underwater photography tool. It uses six powerful thrusters combined with software to let you get smooth footage and sharp images even in strong currents. The 4K sensor sits behind a 160º wide-angle lens which can be augmented with color-correcting filters, captures 8-megapixel stills, and sends a 1080p live stream back to the surface. Video game-like controls reduce the learning curve to minutes instead of hours or days, and 3,000-lumen LED lights let you see when you've lost touch of the sun's rays. It comes with a hardshell carrying case and a battery good for four hours of run time.