Underwater Drone

Our piloting sonar, mounted on a tiltable head alongside the stereo cameras, allows the pilot to view both in front of and below the ROV, even in zero-visibility conditions.

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Blueprint Subsea

Specifications:

The Blueprint Subsea M-Series sonars, M750d, M1200d, and M3000d, mainly differ in range and image detail.

• The M750d is the most versatile, offering long-range performance (up to 120 m) and clear imaging for navigation and general inspection.
• The M1200d provides higher resolution but shorter range (around 40 m), ideal for detailed structural or hull inspections.
• The M3000d delivers the sharpest, most detailed images at very close range (up to 30 m), making it perfect for precision tasks like target identification or search and recovery.

All models share the same compact housing, and 500 m depth rating.

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DVLs (Doppler Velocity Logs) enable accurate underwater navigation, altitude maintenance, and real-time velocity measurement by analyzing Doppler shifts from acoustic signals reflected off the seabed. Additionally, they can assess current profiles for flow analysis.

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Nortek

Specifications:

• The Nucleus 1000 is a compact, cost effective, sensor hub combining a Doppler Velocity Log (DVL), inertial sensors (AHRS), altimeter, pressure and temperature sensors in one package. It can perform bottom-tracking (altitude to seabed) from about 10 cm up to 50 m, estimate velocity, attitude, heading, and also perform water-tracking and current profiling functions. It is rated for 300 m depth in its default version (with a deeper rated version available).
• In contrast, the DVL 500 Compact is more focussed on high-accuracy Doppler velocity measurement and bottom-tracking as its primary role. It supports bottom-track from 0.1 m up to 175 m and is rated to 300 m depth. It also supports water tracking, current profiling, and has built-in sensors like pressure and temperature, but it lacks the full integrated inertial / attitude / heading sensor suite that the Nucleus provides.

Which to pick:

• Nucleus 1000: Best when you need a fully integrated navigation package in one compact unit.
• DVL 500 Compact: Best when you already have separate navigation sensors and want maximum DVL precision and range.

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Our navigation unit combines dual GNSS sensors with an Ultra-Short Baseline (USBL) positioning system to provide precise localization and accurate heading estimation for the Tethys ONE. Using acoustic signals, it measures underwater depth and precisely determines the ROV’s global position. The system’s flexible design allows it to be mounted on nearly any vessel, fixed structure, or platform, and it can also be configured for use by nearby divers.

Blueprint Subsea (USBL)

Specifications:

• The Blueprint Subsea SeaTrac Standard is a real-time and precise underwater acoustic positioning system combining an X150 USBL beacon and an X010 modem beacon, capable of localizing our Tethys Robotics systems.

The multibeam echosounder captures the data used to generate 3D bathymetric models, both in real time and during post-processing.

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Cerulean Sonar

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Specifications:

• Surveyor 240-16 MBES is a 240 kHz multibeam echosounder featuring a 4° along-track and 80° cross-track transmit beam. Designed for high-resolution mapping and inspection, and is ideal for Tethys ROV systems and shallow-water survey operations.
• Depth-rated to 300 m, it achieves effective survey depths of up to ~50 m, and more in favorable bottoms such as hard sand, rock, or compacted sediment. Consuming 5 W at idle and up to 15 W when pinging, it weighs 790 g in air (145 g in water) and connects via 100Base-T Ethernet on a 10–30 V power supply.

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CP Probe: contact probe that provides a means of carrying out underwater cathodic protection potential measurement.

Specifications:

• UCP1A lets you mount a cathodic protection contact probe on a small observation ROV, enabling live CP potential measurements on submerged assets (hulls, pipelines, sacrificial anodes, etc.) while navigating.
• The UCP1A probe has a Delrin body, stainless steel tip, outputs a voltage reading when contacting the surface.

Cygnus Mini ROV Mountable UT Probe is an ultrasonic thickness gauge designed for integration with small observation-class ROVs, using a multiple-echo technique to measure metal thickness through coatings without removing paint or insulation, with an accuracy of ±0.1 mm.

Specifications:

• Rated to 500 m depth, it measures steel thicknesses from approximately 3 mm to 250 mm (depending on probe frequency), operates on 7.5–30 V DC at up to 150 mA, and transmits real-time readings via RS-422 to surface software or a topside repeater that can overlay thickness data on the ROV’s camera feed.

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This probe is ideal for in-service inspection of ship hulls, offshore platforms, pipelines, and other subsea structures—allowing operators to assess corrosion and remaining wall thickness efficiently while the ROV navigates underwater.

The cavitation cleaning system consists of a zero-thrust cavitation cleaning lance, a neutrally buoyant high-pressure hose, and an electric high-pressure unit.

Specifications:

• Zero Thrust Lance: Max. recommended working pressure 300 bar (4350 psi) / Maximum design pressure 500 bar (7250 psi) / Maximum flow 80 LPM (21 gpm) / / SIR certified / Lance length 680mm / Retro lance length 225-435mm
• High Pressure Hose: 1 /2″ Neutrally Buoyant High Pressure Hose (W.P. 390 bar) / 50 mtr / Quick-connect couplings / Recommended for ROV cavitation cleaning
• Electric High Pressure Unit: Electric motor 8,8 Kw / 400VAC 3-phase / 4 wheels with air tyres / Max. 1500 rpm / Strong, lightweight frame / Max. pressure 21 LPM at 250 bar (5,5 gpm at 3625 psi) / (Weight 161kg) / Dimensions: 900x750x950mm

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The 3-axis manipulator enhances versatility and precision by providing multi-directional control, allowing for intricate and efficient handling of objects in various applications.

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Reach Robotics

Specifications:

• Reach Alpha manipulator arm is a compact, all-electric underwater robotic arm for portable ROVs, offering approximately 0.4 m reach, a lift capacity of 2 kg at full extension, 600 N closing force, and joint positioning accuracy of 0.1°, using fully sealed actuators for reliability in harsh environments.
• Rated to 300 m depth, it weighs around 0.9 kg in water, draws up to 35 W from an 18–30 V power supply, and communicates via RS-232 or RS-485.

• Underwater metal detector: It is an essential tool for marine missions, utilizing electromagnetic fields to accurately locate metal objects beneath the water's surface.
• Magnetometer: It serves as a key tool for detecting and mapping magnetic anomalies beneath the ocean's surface, aiding in various applications.

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