Tethys one
The TETHYS ONE ROV is a compact, remotely operated underwater vehicle designed for deep-sea exploration and inspection tasks. Built for versatility and ease of use, it features high-resolution cameras, powerful thrusters for precise maneuvering, and a durable frame capable of withstanding harsh marine environments.
Ideal for scientific research, infrastructure inspection, and environmental monitoring, the Tethys One combines portability with advanced underwater capabilities, making it a reliable tool for both professionals and researchers.





Automated inspection and assessments in rough waters
Tethys takes the inspection to a new level where it can be performed reliably, safely, efficiently, anywhere, and anytime.
Specifications
35 KG
ROV Weight
300M
Depth rating
10 MIN
Setup Time
2 KM
Wired operating range
3,5 KN
Water current with stationary Inspection
4 hours
Runtime (hot-swappable batteries)
o2
360º terrain awareness
• movement control 360º in roll, pitch, and yaw
• DVL, side- and front-facing sonar sensors for 360º awareness
• terrain following
• obstacle avoidance
o4
Intuitive manipulation
• 4D manipulation & grabber
• underwater lifting capacity: equivalent of one fully equipped diver
• allows new operators to effortlessly manipulate and interact with the environment
O1
Autonomous Operation
• autonomous & repeatable area coverage/structure scanning
• position & orientation hold
• depth and distance lock to ground and objects
o3
positioning in strong currents
• drone holds position on its own, despite strong currents
• stationary work in water currents up to 3.5 knots
• operation in rivers and tidal currents
o5
Recording & reporting
• 3D mapping in poor visibility
• user-friendly UI with mini-map
• 180º tiltable full HD cameras & front-facing multibeam sonar
• placing points of interest any time
• live recording and reporting during mission
• post-processed photogrammetric & acoustic 3D models enabled
Modular by Design
Tethys One is a fully equipped underwater drone featuring a standard sensor suite that enables precise navigation and detailed mapping.
Its adaptable architecture supports a wide range of payloads, allowing seamless integration with tools for environmental monitoring, object manipulation, and high-accuracy scanning. Elevate your 3D modeling with data inputs like metal detection, water flow, pressure, temperature, oxygen concentration, material thickness, and non-destructive testing (NDT), among others.
-
The 4-axis manipulator is a soft-end effector and enhances versatility and precision by providing multi-directional control, allowing for intricate and efficient handling of objects in various applications.Optional: Soft end-effector for enhanced manipulation
-
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.
-
By emitting sound waves to the ocean floor, sonar systems generate intricate images of underwater landscapes and objects, facilitating efficient seabed mapping and target detection. In addition to a standard forward-looking multibeam imaging sonar, we also offer the option to install side-scan sonars.
-
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. -
Short Baseline System (SBL) utilizes sound waves for measuring underwater depths and determining the global position of the underwater drone. Additionally, it can be outfitted for use by nearby divers.
-
A CTD sensor measures the conductivity, temperature, and depth of water with high precision, providing crucial data for determining essential physical properties of the environment
An underwater pH sensor plays a central role in marine studies, as it measures the acidity or alkalinity of the water and thus provides important data for monitoring the aquatic environment.
Contact Our Rov expert
René Meisel
Product Manager - ROV Pilot Inspection & Defence
(+45) 91 82 14 62
rm@sepcotech.com