# data[].attributes.body
The two main types of unmanned water vehicles are unmanned surface vehicles (USVs) and unmanned underwater vehicles (UUVs). There are also autonomous underwater vehicles (AUVs) and remotely operated underwater vehicles (ROVs).

# data[].attributes.body
USVs are a type of unmanned vehicle that is controlled on the water's surface. According to saildrone.com, "Saildrone USVs are equipped with GPS and an onboard computer, enabling the vehicles to navigate following prescribed waypoints, while staying in a safety corridor, taking winds and currents into consideration autonomously." Saildrones are used to collect ocean data and monitor the planet.

# data[].attributes.body
UUVs have propellers, cameras, live video, and are controlled remotely. They also have a tether back to the land, and since this tether transmits live video, if something goes wrong, it can be easily brought back to land. An example of a UUV is the DARPA-sponsored Submarine Hold at RisK (SHARK). The SHARK UUV is an active sonar platform designed to detect and track stealth submarines.

# data[].attributes.body
AUVs are robots that travel underwater without requiring input from an operator. The oil and gas industry is one of the main users of AUVs. They use them to make detailed maps of the seafloor before placing subsea infrastructures, like pipelines. They are more cost effective to use, when comparing them to manned vehicles, and the three types are shallow, medium, and large.

# data[].attributes.body
ROVs are tethered vehicles, sometimes called "underwater robots", and are under the direct control of a human operator. An ROV can stop, hover, and bring back an object or water sample to the surface using a manipulator arm or other mechanical device. The four different types of ROVs are, work, light work, observation, and micro. ROVs have been used to locate many historic shipwrecks, such as the Titanic, and have been used to recover material from the sea floor and bring it to the surface.