What are underwater vehicles?
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)
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)
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)
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)
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
Test dives for Alvin’s 6500 meter certification have been postponed, a day after the sub reached a record 5338 meters (17,513 feet)
Alvin engineer and pilot Drew Bewley on what best prepared him to work on a one-of-a-kind submersible and the overhaul that will take Alvin to 6500 meters.
Interview with Danik Forsman, Alvin Pilot and mechanical section leader on rebuilding Alvin for 6,500-meters and mentorships that helped him become a pilot.
Lane Abrams talks about designing electronics for the bottom of the ocean and project management of Alvin’s electrical updates for the 6500 meter overhaul.
An interview with Francis Elder, lead mechanical engineer for the Alvin Group. Find out how the team has designed a new pump to take Alvin to 6,500 meters.
WHOI in the News
From Oceanus Magazine
A mechanical engineer, pilot, and expedition leader on vehicle design and adventures at sea
A Mechanical engineer on independent workflow and collaboration
How the famed submersible found a lost hydrogen bomb in the Mediterranean Sea during the height of the Cold War
For MIT-WHOI Joint Program student Amy Phung, virtual reality and robotics are a natural pairing for ocean exploration
Alvin Certification Coordinator Lisa Smith on working with Naval Sea Systems Command (NAVSEA) to get HOV Alvin cleared for diving.