Underwater drones can now be operated from farther away, but that does not necessarily mean they are free-swimming and controlled over Wi-Fi. Most live-piloted remotely operated vehicles (ROVs) still use an underwater tether. A buoy can relay that tethered vehicle’s video and control signals to an operator on shore, while experimental acoustic links can send commands underwater without a cable. Autonomous underwater vehicles (AUVs) add another option: remote operators can supervise missions, but they are not necessarily steering the vehicle continuously.
How does an underwater drone get a signal underwater?
Ordinary radio signals, including Wi-Fi and cellular, dissipate rapidly in water. A connection from a phone or control room to a surface buoy does not mean those signals reach a submerged vehicle directly. Underwater systems instead use a physical tether, sound waves, or—in some conditions and over short distances—light.
Tether: the established choice for live piloting
In a conventional ROV setup, a tether connects the vehicle to a ship or surface control station. It carries commands down to the vehicle and returns video and other data. NOAA describes pilots steering with joysticks or touchscreens while using live video and sonar. The tether supports a robust, high-bandwidth connection, though the cable can limit movement and needs to be managed. NOAA Ocean Exploration’s ROV overview explains the arrangement and its uses.
Buoy relay: underwater tether, remote operator
A hybrid system keeps the underwater tether but connects it to a floating module or buoy. The buoy then relays communications over a surface network, such as cellular or satellite, to an operator elsewhere. This can move the operator away from the vessel or work site; it does not make the submerged vehicle itself directly reachable by ordinary radio.
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The U.S. Bureau of Reclamation describes this distinction between buoy-mediated control and fully wireless underwater operation in its report on underwater remotely operated vehicles. Its discussion of commercial availability reflects the report’s publication period, not a verified 2026 inventory.
Acoustic link: commands through water without a cable
Sound can carry signals underwater, making acoustic communication a possible route to untethered control. But it is a constrained channel: sound travels at about 1,500 metres per second in water, and reflections from the surface, seabed, or nearby structures can create delayed signal paths. Doppler shifts and environmental noise can also interfere. These factors affect latency, reliability, and how much data can be carried.
NTT Network Innovation Laboratories says practical underwater acoustic communications have generally been below 100 kbit/s, a rate more suited to sensor data than continuous video. In a 2023 report, NTT describes a communication experiment demonstrating more than 1 Mbit/s over 300 metres. These are NTT’s reported results, not a general guarantee for acoustic links. NTT’s article, “Underwater Acoustic Communication Technology for Wireless Remotely Operated Vehicles,” says: “Bi-directional acoustic communications enable the remote control of the wireless ROV.”
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NTT also describes a wireless ROV demonstration at Shimizu Port: an operator controlled the vehicle from a ship while receiving video at 640 × 420 pixels and 10 frames per second. The bidirectional acoustic link carried video and vehicle attitude upward, and control commands downward. NTT characterizes this as research and development, with more work needed on speed, distance, and stability; it is evidence of feasibility, not a plug-and-play product with global range.
Optical link: more data over a short, clear path
Underwater optical links can support higher bandwidth than acoustic links, but need suitable visibility and alignment. Turbidity and the need for a clear line of sight limit their range. The ExRay product page describes a free-flying vehicle connected to a relay ROV by an optical underwater modem, with control, telemetry, and live video up to about 30 metres beyond the relay. That is a short-range extension around a relay vehicle, not a long-distance connection to shore. See the ExRay system description.
How far away can you control an underwater drone?
There is no single range figure: the answer depends on what is being measured. A vehicle’s mission range, an acoustic link’s reach, the distance beyond an optical relay, and the operator’s surface-network connection are different quantities. Nor does a long mission range establish that an operator can manually steer the vehicle and stream video continuously at that distance.
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| System or approach | What the distance or capability describes | What the operator does |
|---|---|---|
| Conventional tethered ROV (NOAA) | Tether connects vehicle to ship or surface control station; the source does not state a general range. | Live piloting using video and sonar. |
| Wireless ROV experiment (NTT, 2023) | More than 1 Mbit/s over 300 metres in a communication experiment; a separate demonstration transmitted 640 × 420 video at 10 frames per second. | Live control over bidirectional acoustic communications in the described demonstration. |
| ExRay optical relay (manufacturer description) | Up to about 30 metres beyond a relay ROV. | Control, telemetry, and live video for a free-flying vehicle near the relay. |
| Saab LRAUV (manufacturer specifications, 2026) | 1,000 km stated vehicle range; operational depth 0–300 m, with a 0–1,500 m option. | Remote mission planning and supervision of an autonomous vehicle, not necessarily continuous joystick piloting. |
| Oceaneering Liberty Resident System (manufacturer description) | Onshore connection through an integrated buoy and a 4G LTE surface link; the source does not state a general operating range. | Remote operation with control data and high-definition video through the described system. |
These figures are not directly comparable. For example, Saab’s stated 1,000 km is a vehicle range, while NTT’s 300 metres describes an acoustic communication experiment and ExRay’s roughly 30 metres describes extension beyond a relay ROV. They do not measure the same kind of reach.
Can an underwater drone be controlled from shore?
Yes, in some system designs, but the communications path matters. A shore-based operator might connect over cellular or satellite to a buoy, which remains linked to an ROV underwater by tether. An industrial system may use subsea infrastructure and a surface buoy to carry control data and video between a vehicle and an onshore operations centre.
Oceaneering says its Liberty Resident System uses an integrated buoy and a 4G LTE surface connection to let a subsea ROV communicate with an onshore operations centre, including control data and high-definition video. In the setup the company describes, this can remove the need for a vessel physically stationed over the operation. It does not mean the ROV is using cellular signals underwater.
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For an individual vehicle product example, Blueye describes a tether to a surface unit with wireless control from shore or a boat. That is another hybrid arrangement: the operator’s connection to the surface unit is wireless, while the underwater vehicle remains tethered. See Blueye’s professional ROV description.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How AUV remote supervision differs from ROV piloting
An autonomous underwater vehicle follows a planned mission and can be remotely supervised or receive mission updates. That is different from continuously steering an ROV with a joystick and watching a live video feed. A satellite or cellular connection listed for an AUV should not, on its own, be read as proof of uninterrupted live video or direct manual control at every point in its mission.
Saab lists Wi-Fi, cellular, satellite, and acoustic communications for its LRAUV, along with a web-based mission planner accessible from anywhere in the world. Its 2026 specifications state a range of 1,000 km and an operational depth of 0–300 m, with a 0–1,500 m option. These are manufacturer-stated specifications for an autonomous vehicle; they describe mission capability and remote planning, not a claim of continuous satellite joystick piloting. Details are on Saab’s LRAUV page.
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What determines whether a wireless underwater link is practical?
The right architecture depends on the job, not just the headline distance. A live-piloted inspection needs a dependable path for control and enough bandwidth for useful video. A sensor mission may tolerate a much lower data rate, while an autonomous survey may need only mission updates and periodic status reports.
- Live video needs: resolution and frame rate affect how much data must be sent; an acoustic channel may not support the same video experience as a tether.
- Latency and reliability: propagation delay, reflections, noise, and Doppler effects can make an acoustic link less responsive or stable.
- Water conditions: optical links need visibility and alignment, so turbidity can reduce their usefulness.
- Operating environment: depth, nearby structures, seabed and surface reflections, and environmental noise affect link design.
- Power and endurance: the vehicle’s energy budget and mission duration matter alongside communications range.
- Operational role: distinguish manual piloting from autonomous mission supervision before comparing any quoted range.
The practical tradeoff is among range, bandwidth, latency, water clarity, reliability, vehicle power, and whether live video is necessary. For now, tethered ROVs remain the established choice for live piloting and video; buoy relays can make the operator more remote without removing the underwater cable, while acoustic and optical systems address narrower wireless use cases.
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