In order to understand the ocean, scientists often find they have to get themselves or their instruments into very specific parts of it. Traditionally, researchers have used ships to photograph the depths, to drop floats and drifters into the currents, and to collect samples of water, rock, and marine life. In recent years, the spectrum of available observing tools has grown to include human-occupied submersibles, remote-controlled vehicles, and autonomous robots.
Human Occupied Vehicles (HOVs) take small teams of scientists and engineers directly to the seafloor for limited periods of time. They usually accommodate three people and are built to withstand the extreme pressure thousands of meters below the surface of the ocean and permit scientists to make detailed observations, collect specific samples, and place, retrieve, or conduct experiments on the seafloor and in the deep ocean. In addition to the vehicle’s manipulator arm, cameras, sensors, and collection instruments, the HOV also carries another important data-gathering device: the scientists’ own eyes and knowledge of the deep, which is a key advantage of using the vehicles, despite the additional complexity of designing and deploying them.
Remotely Operated Vehicles (ROVs) are tethered robots that allow researchers to make observations, collect samples, and conduct experiments while controlling the vehicle from the surface. The vehicles can remain below the surface for a day or more at a time, and can hover like a helicopter over a seafloor target or survey a wide area. The tether sends and receives control signals, vehicle sensor data, and images and allows the pilot to control the vehicle’s manipulator arm in real time to carry out targeted surveys and collections, and help carry out detailed experiments in the deep ocean.
Autonomous Underwater Vehicles (AUVs) are programmable, robotic vehicles that, depending on their design, can drift, drive, or glide through the ocean without real-time control by human operators. Some AUVs communicate with operators periodically or continuously through satellite signals or underwater acoustic beacons to permit some level of control. AUVs allow scientists to conduct other experiments from a surface ship while the vehicle is off collecting data elsewhere on the surface or in the deep ocean. Some AUVs can also make decisions on their own, changing their mission profile based on environmental data they receive through sensors while under way.
Hybrid Remotely Operated Vehicle (HROVs) combine design advantages of two types of vehicles in a single platform. An HROV can operate as a free-swimming autonomous underwater vehicle (AUV), flying through the ocean like an aircraft to survey and map large areas with onboard sonar, sensors, and cameras. It can also be converted aboard ship into a remotely operated vehicle (ROV), connected to a surface ship via a lightweight, micro-thin fiber-optic tether that permits scientists and operators on the surface to control the vehicle and its manipulator arm to carry out targeted surveys and collections, and help carry out detailed experiments in the deep ocean.
News & Insights
The Human Occupied Vehicle (HOV) Alvin returned to Woods Hole, Mass. this spring for the final phase of an overhaul that will allow the submarine to dive to 6,500 meters.
Molly Curran is a mechanical engineer in WHOI’s Deep Submergence Laboratory. She works on the design and operation of deep-sea robotic systems, including remotely operated vehicles, autonomous vehicles, and deep-sea samplers. She was the institution’s first pilot for Mesobot, WHOI’s latest autonomous robot designed to study the midwater realm known as the ocean twilight zone.
WHOI engineer Robin Littlefield is on a mission to increase the reach of science through the development and operation of autonomous underwater vehicles.
WHOI’s new deep-sea autonomous underwater vehicle moves one step closer to exploring the hadal zone—the deepest region of the ocean—to search for new clues about the limits of life on Earth, and possibly beyond.
Rick Chandler is a senior submersible engineer and administrator for the Alvin Group at Woods Hole Oceanographic Institution, where he’s worked for more than 45 years.
WHOI in the News
From Oceanus Magazine
WHO scientists and engineers are developing an innovative autonomous deep-sea vehicle with hovering and manuevering capabilities that will allow it to follow animals without disturbing their environment and behavior.
Decades of research from many WHOI scientists and engineers have culminated in a multifaceted vehicle to explore deep-sea marine life.
The ocean is an extreme environment that is hard for humans to explore. One solution is building deep-sea robots that can autonomously make decisions on what to look for and where.
WHOI’s free-swimming robot Sentry completed its 500th dive on October 16, 2018, off the Pacific Coast of Costa Rica. The autonomous underwater vehicle has used its sonar systems to help scientists map the seafloor, track the Deepwater Horizon oil spill, locate the voyage data recorder on the sunken El Faro cargo ship, and carry out advanced research on many other missions to help us better understand our ocean and our planet.