QYSEA FIFISH V6s Underwater Drone

Best Underwater Drones ROV 2021

M2 Underwater drone ROV

Always wanted to find treasures underwater? Here is one great solution an Underwater drone or ROV remotely operated vehicle.

You probably know Airborne drones and pretty much the same is available for underwater.
However there are a few more technical difficulties for underwater drones. Water pressure, light, currents and so on.


Technically it should be called ROUV remotely operated underwater vehicle but commonly just called ROV) it is an unmanned underwater vehicle.

First things first, you can operate the ROV from the outside and don’t have to get wet or in the water. The outside can be a vessel, ship, dinghy or just from land.

Tether Cable

ThorRobotics Underwater Drone ROV

Due to water density a normal remote control wouldn’t work underwater, the connection would break off just below the water surface. So the ROV is tethered which is a cable connected with the ROV and running up to the mother-ship from there it is usually connected via Bluetooth, WiFi or a physical cable connection with the remote controller.

Most Tether cables are built tough so they can be pulled on with a tension of around 50kg.

Underwater drones can be used in many different ways

  • Educational
  • Surveys
  • Military
  • Science
  • Broadcast use
  • Fish Farming
  • Hobby use
  • Public Safety & Law Enforcement
  • Treasure hunting
  • Boat hull inspection
  • Reservoir inspection
  • Dam inspection
  • Aquarium works


Robotic arm underwater drone

Sophisticated attachments are available for purchase such as a robotic arm, a claw, scissors, clippers, drills or a soil sampler obviously depending on what model you own or want to purchase.


Some drones come with an exchangeable Battery pack so you don’t have to wait until the drone is charged to do your next mission you can then just bring the underwater drone back swap it out put your spare Battery pack in and off you go again.

Battery sizes are mostly kept below a 100Wh due to airplane regulation and the aviation flight control.


The latest models have up to a 4k UHD Camera with a wideangle lens commonly you can also film in slow motion and many come with Image stabilization.
You can also take pictures with the same Camera mostly around 12MP.


You can have integrated LED Lights or sometimes you can attach external lights lights to your underwater drone.

Depth rating

Dive Depth Sign

Underwater drones are mostly rated to a depth of 330 ft (100m) but some also can go up to 660 ft (200m) and out to a maximum horizontal radius of 660 ft (200m)


Most of the Underwater drones reach speeds of around 3 Knots.


Most underwater drones are equipped with 4-8 thrusters (vertical + horizontal and sometimes on a 45° Angle) which are as well replaceable propellers due to wear and tear. The latest versions are fully maneuverable in any way; Lateral, Arc Rotation, 90° up/down, 360° pitch/yaw/roll.

Underwater drone movement
Underwater drone movement possibilities

Depth holding

Your Underwater drone should be equipped with a depth sensor to perform smart hovering at targeted depth and direction or to do targeted close-up or posture positioning.


Weight of an underwater drone starts at around 4.0KG (8.8 lbs) and can go up to around 10Kg (22lbs) with all attachments.

Live broadcast and Social media sharing

Many underwater drones support live broadcast Taking photos and recording video, quick editing and Share to social media

Testing an underwater drone

Most underwater drones ROVs are tested in swimming pools and lakes where the water is calm, however some have tested their own personal ROVs in the sea. Doing so, however, creates difficulties due to waves and currents that can cause the ROV to stray off course or struggle to push through the surf if the waves are too big and the current to strong and due to the small size of ROV propellers.

Our recommendations for a great underwater drone are

M2 Professional Underwater Drone

M2 Underwater drone ROV
M2 Underwater drone ROV
  • Full 360° Maneuverability
  • 8 vectored thrusters
  • Anti stuck motor
  • Maximum speed of 3 Knots
  • Depth rated to 330 ft (100m)
  • Tether Cable length 100m (Optional with 200m tether and winder)
  • Maximum horizontal radius of 660 ft (200m)
  • Aluminum alloy
  • Weight 4.5KG / 10lbs, which allows single-person operation and quick-deployment in around 3 minutes
  • Freedom to Attachments; The underwater drone compatible with sophisticated attachments such as gripper, GoPro, external LED lights, laser calipers, sensors, etc; The maximum attachable capacity is 3.3 lbs, which supports all your needs for exploring in a variety of application scenarios
  • Exchangeable Battery Modules
  • Default 97.68WH lithium battery included (Optional 200WH Battery not included)
  • Dive time is 2-4 hours
  • 64G micro SD memory card (included) removable
  • maximum 512gb micro SD (not included)
  • 4K 1080p video and 12-megapixel photos.
  • EIS Image Stabilization Camera
  • Ability to take photos while recording video
  • Time-lapse photography
  • 2 x 2000 lumens LED lights
  • User-Friendly Interaction
  • Depth, temperature, and other parameters can be recorded at the same time
  • Live broadcasting
  • Social media sharing
  • It can stream the footage directly to a smartphone or tablet mounted on the included remote, as well as save it on a removable SD card docked inside the underwater drone
  • HDMI output to other monitors or devices

QYSEA FIFISH V6s Underwater Drone ROV

QYSEA FIFISH V6s Underwater Drone
QYSEA FIFISH V6s Underwater Drone
  • Bionic Exterior Design, Strong Force, Flexible Operation:
  • 100N clamping force, with clamp lock function
  • 100N towing force
  • UHD Camera 166˚ ultra-wide-angle
  • Image Stabilization
  • Slow motion at 240 fps
  • 12 Megapixels Pictures
  • RAW image in DNG
  • 2 x 2000 lumen LED Headlight
  • Maximum depth 100 m (330 feet).
  • Easy to Operate-FIFISH V6 is very easy to operate.
  • Drone app
  • Forward backward, move up and down, tilt up and down and lock the depth, support ±45° adjustable tilt mode.
  • Depth Holding
  • Speed is up to 2 m/s (7.2km/h)
  • 64GB memory card (included)
  • Comes with VR glasses VR INTUITIVE World’s 1st Motion Sensor Headset we have ever designed that allows you to rotate the drone underwater seamlessly and intuitively
  • Battery life 6 hours dive time
  • Uses 14,000mAh, 155Wh battery
  • Measures 15 x 13 x 5.6″
  • Weighs 8.6 pounds
  • Social media sharing
  • Posture Lock feature holds ROV at set angle within ±0.1° pitch and roll
  • Connectivity 328′ / 100 m Tether

ThorRobotics Underwater Drone ROV

ThorRobotics Underwater Drone ROV
ThorRobotics Underwater Drone ROV
  • Weight: 4.2kg
  • Overall Length: 360mm
  • Beam: 200mm
  • Draft: 160mm
  • Height: 200mm(With handle)
  • Prop: 4x OD 28mm
  • 4 Vector thrusters 4x 8000rpm
  • Light: 2x 300 lumen
  • Speed: 1.5 knots (2.8km/h)
  • Max. Depth: 30m
  • Tether cable wire Length:30 meters
  • See & Record in 4K UHD
  • Streaming & Recording
  • Maximum Control Range 100M
  • Depth hold
  • Preassembled hull kit
  • 16 GB SD card

Poseidon Underwater Drone

Poseidon Underwater Drone ROV
Poseidon Underwater Drone ROV
  • 4K UHD Camera
  • 30fps 1080p Video
  • 160° wide angle lens
  • CMOS image sensor
  • Color Filter Red and purple
  • 32/64G storage
  • 6 Thrusters (4 vertical + 2 horizontal)
  • Achieve 360° attitude control
  • Built-in posture sensor
  • Dive to 150m (492ft)
  • lights 2×1500 Lumen
  • Adaptable interface enables add-ons like robot arm, hydrophone, sonar for different usage (Not included)
  • 9000mAh battery
  • Live Video feed to your phone or tablet via wireless transmitter

Additional Equipment for Underwater Drones ROV’s

eMart UV Ultra Violet

eMart UV Ultra Violet
eMart UV Ultra Violet
  • 10W 395-400nm UV Light, Waterproof for 100m Underwater, Great for Diving
  • Come with Magnetic Control Switch, The Light Brightness Could Be Adjusted Smoothly
  • Come with 2 x 18650 Battery, Easy for Charging Slip-Resistant, Portable, Stable Light
  • Durable Aerial Aluminum Alloy Casing, Long Service Life UP To 100,000 hours


  • Coiled Lanyard Expands to 36″ (91.4 cm)
  • Corrosion Resistant Spring
  • Loaded Gate Clip Gate Clip has 360 Degree Swivel
  • Lanyard and Split Ring
  • Attachment Split Ring: corrosion Resistant Stainless Steel

Universal Smart Battery Charger

Universal Smart Battery Charger
Universal Smart Battery Charger
  • 1. Safety First: S4 4 Slot plug in Recharger Compliant Standard–UL cUL TUV GS PSE FCC CE C-TICKCB ROHS,and with Intelligent Circuits, Fire Retardant Materials. Please confirm your battery is genuine / not damaged / quality / Rechargeable before charging.
  • 2. 4bay Universal Charger Charges Simultaneously almost all types Rechargeable Batteries of Multiple Different Specifications: NiMH Ni-Cad Double A Triple A AA AAA AAAA C SC Nicd, Lithium-ion Li-FePO4 IMR INR ICR 26700 26650 26500 25500 22650 18700 18650 18490 18500 18350 17670 17650 17500 17355 16650 16340 RCR123A 14650 14500 14430 10440 18659 20650 18560 Liion Protected Rcr123 Quad 3.2 Volt Battery etc.
  • 3. 4cell Speedy Charger Compatible with: Button Top Eneloop 2000mAh AA 2 Hour, Compatible with Amazonbasics 800mAh AAA 0.8-Hour at 1 amp rapid Current, Compatible with Flat Top 3.7V 3400mAh Lithium ion Panasonic NCR18650B 3.5-Hour, Compatible with 3.6V 2500mAh Li ion High Drain LG HE2 2.5-Hour @ 1A quick Charge Current.
  • 4. Four Pack Cells Digital LCD Display Smart Charger: Automatically Detect battery Status, Select Charge Mode, Cut Off at Full Power or Overtime, and LCD Screen Displays Each Cell’s Voltage and Type, Charging Current and Time Independently. 2 Charge Current (500mA Slow/ 1000mA Fast) and 3.2V LiFePO4 Options to be Chosed Manually.
  • 5. What you get: EASTSHINE S4 Universal 4 Slots updated 2020 Household Battery Chargers, DC 12V – 24V Auto Vehicles / AC 100V – 240V US Wall Adapter, User Manual, Happy Card with 24 Hours Warm Service, 30 Days Free Refund, 2 Years Free Replacement, Lifetime Maintenance. Do not charge a damaged / inferior battery.

316 Stainless Steel Double Ended Bolt Snap Hook 4-1/2”

Double Ended Bolt Snap Hook
Double Ended Bolt Snap Hook
  • Advantage: Our Superior Quality & Extra-Secure double ended bolt snap hooks are made of “MARINE GRADE 316 Stainless Steel”, corrosion resistant and very durable, can definitely be used in seawater environments.
  • Wide Range of Uses : Designed for use with rope, chain, straps, animal leashes and other home, farm and recreational applications. Can be used for a gate latch, a bucket hanger, hanging feed tubs, hay bags in the stall and many other various uses. Clips with any standard D-Rings. Perfect for connecting your diving accessories to your BCD.
  • Practical Features: Double-ended design makes bolt snaps more versatile. Spring-loaded bolts provide secure closure & easy-open thumb lever.
  • Fair Use Is Important: Don’t overload for your safety, working load limit 244 Lbs(110 kg.)
  • What You Get: 2-pack [4-1/2 Inch Double Ended Bolt Snap Hooks], our worry-free 12-month warranty and friendly customer service.

Additional Equipment for Underwater Drones ROV’s and night dives

SecurityIng Strobe Light Scuba Night Dive Marker

SecurityIng Strobe Light Scuba Night Dive Marker
SecurityIng Strobe Light Scuba Night Dive Marker
  • Signal Light for Location – It is ideal for keeping tabs on the location of your partners during a night dive, or when exploring dark areas of the underwater world during daytime. Great for hanging on diving tanks or BCD for easy and clear location and identification during dives.
  • Rotary Switch & Multi-purpose – Featuring a twist on/off switch at head, very easy to operate. Tighten the head to turn on the light, unscrew the head to turn off. This lighting device is a firefly beacon led signal light for safe diving. Can also be used for jogging, camping, fishing, kayaking, raving, group outing at night, team tag, walking with family.
  • 5 Colors Are Available – Red, white, blue, green and yellow light led are available. You can use different colors to identify buddy teams quickly and easily. Please note: Each led light with one color only
  • Compact Design & Great Waterproof Performance – Size: 0.87in diameter x 2.32in, net weight is only 16g.The signal light’s appearance is inspired by torpedo, it’s a cute dive signal light. With quality waterproof O-ring, can be used underwater 200m. Include a string for easy attach to dive equipment
  • Long Runtime & Battery Included – Powered by 3 x LR44 batteries which provide a long burn time of approximately 200 hrs. Come with 4 battery pack(12 x LR44 batteries), when the battery drained, you can easily and quickly replace the batteries and start the signal light up again.

Trident LED Light Stick Dive Light

Trident LED
Trident LED
  • High Intensity LED Light with Long Burn Time & Bulb Life
  • Maximum Depth: 330 feet (100 meters)
  • Comes with 3 Batteries LR47
  • LED Type: Japan Nichia LED
  • Approximate Lamp Life: 50,000 Hours

This was our Equipment and buying guide and the list of the Best underwater drones ROV’s on the market in 2021! I hope you enjoyed it and if you did so and don’t want to miss any of our next Equipment guides sign up for the Newsletter here.

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