Source: US FBI
Light and Camera System
Lights and recording functions are controlled from the surface, and high-definition images are displayed on surface monitors. However, divers rarely use lights below the surface because particulate matter churned up from walking on the bottom diffuses any light.
Metal Detectors
Different sizes of underwater metal detectors allow divers to locate large and small objects.
Lift Bags
Divers are prohibited from lifting anything above 15 pounds by themselves. Lift bags inflate to lift objects as large and heavy as 2,000-pound vehicles. Bags are inflated either by divers or, for larger items, by surface-supplied air.