Tethys Robotics Tethys One

Pioneering professional-grade inspections in the toughest underwater conditions, the Tethys One is engineered for industrial use, especially in rivers, tidal zones, offshore installations, hydropower, and search & rescue operations 

Deploy in under 10 minutes and inspect confidently at depths of up to 300 m. Stay stationary in tidal, river, and hydropower currents up to 3.5 knots. Stream high-definition video, generate live 3D models, and easily integrate custom sensors—from sonar to manipulators. Built robust, built smart, and ready to revolutionise underwater operations.

Autonomous precision with real-time georeferenced mapping

720° sensing in poor visibility environments

4-axis manipulator supports diver-level tasks

Endless modularity: sensors, NDT tools, CTD, pH, magnetometers, sonars, and more

Key Specs

Weight: 35 kg in air (77 lb) 

Deployment: Ready in just ~10 minutes—no extra gear needed 

Depth Capability: Rated to 300 m (984 ft) 

Tether Range: 2 km with option to extend

Battery: 4 hr runtime, hot-swappable 

Current Resistance: Stationary operation in currents up to 3.5 knots (≈2 m/s) 

🌊 Core Capabilities

Autonomous Operation

Execute repeatable area scans with precise position, orientation, depth, and distance locks 

Total Terrain Awareness

720° awareness thanks to DVL and side/front sonar; enables terrain following and obstacle avoidance

Stationary in Strong Currents

Built-in thrust system maintains position autonomously in currents up to 3.5 knots—perfect for river, tidal, and hydropower environments .

4D Manipulation

4-axis soft gripper can lift tasks equivalent to a fully-equipped diver

Mapping, Reporting & Reporting

Full HD cameras (180° tilt) plus front multibeam sonar enable high-resolution 3D mapping—even in murky water—with real‑time point tagging, mission reporting, and post-processing into photogrammetric and acoustic models

🧰 Modular Payload Ecosystem

The Tethys One includes a standard sensor suite, with seamless integration of additional tools:

Metal detector & magnetometer

Acoustic sonars (forward, side-scan, multibeam)

DVL and short-baseline positioning for precise navigation

Environmental sensors (CTD, pH, temperature, oxygen, pressure)

UT/XRF for non‑destructive testing

Custom payload options on request

🚀 Why It Matters

Real‑time mission reporting reduces time, expense, and diver risk 

Compact & fast‑deploy—ideal for confined or remote locations (dams, bridges, cables) .

Versatile, robust mapping in low-visibility and high-current conditions—makes it a go-to tool for hydropower, offshore wind, oil & gas, security, search & rescue, and unexploded ordnance missions