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Subsea sensor logging node

Engineered for: Seabed

Fetch supports demanding long-term seabed monitoring projects. You can add the sensors of your choice, they can be deployed for up to 10 years and data can even be harvested using uncrewed systems. You need the versatility of Fetch on your next monitoring project.

At a glance

Popular for seabed monitoring

Long life – up to 10 years battery life

Easy to deploy, easy to recover

Can be configured with a wide range of sensors

Harvesting your data using uncrewed systems

Go and fetch your subsea data

Want to know more?

Use industry standard glass pressure sphere with a global track record

Integrated acoustic release mechanism for easy recovery

Supports data transfer rates of up to 9,000 bps

High capacity battery packs enable 10 year deployments without servicing

Why Fetch is perfect for your operations

For energy

Long term deployment and the ability to harvest data remotely reduce costs of operation and emissions during operations

For defence

Fetch is the underwater gateway to you your sensors. Integrate any sensor, deploy it and remotely harvest your data

For science

It supports the most demanding long-term seabed geodesy projects and you can use our Ranger 2 system to harvest the data


Fetch is a long-life subsea sensor logging node that enables data to be wirelessly extracted via its integrated high speed acoustic modem with a battery life option of up to 10 years.

It can be free fall deployed to the seabed and will land in an upright position. This reduces deployment time and cost.

Fetch can be configured with an array of different sensors dependent on the monitoring application. Standard sensors include high accuracy pressure, temperature and sound velocity as well as inclination. Other sensors can be integrated internally or externally as required.

The ultra-low power subsea sensor logging node powers up sensors only when required and logs and timestamps the data to an SD memory card.

The sampling regime can be configured serially before deployment and via the acoustic modem which is also used to recover the data to the surface. The 9,000 bits per second modem transfer rate enables data to be extracted in minimal vessel time so reducing operational costs.

High capacity primary lithium battery packs enable deployments of many years, dependent on sensor selection and sampling rate.

Fetch is compatible with our Ultra-Short BaseLine (USBL) positioning systems for positioning during deployment/recovery. When the mission is complete, Fetch can be acoustically commanded to release from its stand and return to the surface under its own buoyancy ready for collection.

Why invest


  • Integrated modem with data rates ranging from 100 to 9000 bps

  • > 500 Unique addresses, ideal for large array deployments

  • Sonardyne Wideband®1,2, 2+and HPR 400 USBL mode compatible


  • Integrated modem with data rates ranging from 100 to 9000 bps

  • Easy to set up with configuration and sampling period programmable via telemetry link

  • Glass sphere, titanium parts (except duplex s/steel guard), polypropylene shell

  • Customisable sensor payloads


  • 3,000 or 6,000 m depth rated

  • Up to 10 year deployment life

  • Vessel, USV or AUV data harvesting options

  • Anti-trawl fame option available

Set Up

  • Warranty: 1-year return to Sonardyne service centre

  • ITAR Controlled: No

  • UK Export License: Not required


Feature Type 8306-3873
Depth Rating 3,000 or 6,000 m
Operating Frequency MF (20–34 kHz)
Transducer Beam Shape Directional
Transmit Source Level (dB re 1 µPa @ 1 m) 190-202 dB (4 levels)
Receive Sensitivity (dB re 1 µPa) 90-120 dB (7 levels)
Battery Life (Capacity) 5 years typical (10 years option) (dependent on sensors and sampling interval (180 Ah))
Mechanical Construction Glass sphere, galvanised stand and duplex stainless steel guards and connectors
Operating Temperature -5 to +35°C
Storage Temperature With Batteries 0 to +30°C
Without Batteries -5 to +35°C
Weight in Air/Water1 Fetch 40/10 kg (upthrust buoyancy)
Stand 60/52 kg
Sensors and Options
Temperature (±0.1°C) Optional
Tilt Switch (±30–45°) Standard
Paroscientific DigiQuartz Pressure Sensor (±0.01%) 1,350 m, 2,000 m, 4,130 m, 6,800 m Optional
Strain Gauge Pressure Sensor (±0.1%) Standard
High Precision Strain Gauge (±0.01%) Keller or Presens Optional
Sound Velocity Sensor ±0.02 m/s Accuracy Under Calibration Conditions Optional
High Accuracy Inclinometer Range: ±90°, Accuracy: ±0.05° over 0 - ±15°; ±0.2° over 0 - ±45° Optional
Release Mechanism (Screw-off) Standard
Connector Type Impulse MCIL-8-MP

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Go and fetch your subsea data