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Robot maker · registered

Tethys Robotics

Corporate marketinspectionmarineCurated record
tethys-robotics.ch

Tethys ONE is a compact hybrid AUV/ROV (35 kg) spun out of ETH Zurich with proprietary sensor fusion (sonar, 3D cameras, metal detectors) and SLAM-based navigation enabling autonomous hold-position in currents up to 3.5 knots and full-autonomy mapping at depths to 300 m in zero-visibility turbid water; can be switched between pilot-controlled ROV mode and full AUV autonomy on the same unit; deploys in under 10 minutes without support vessel; targets offshore oil & gas inspections, subsea cable assessment, explosive ordnance disposal, and offshore wind turbine inspection.

HeadquartersZurich, CH
Founded2021
Corporate funding$4M
Team11-50
Deployments3
Open roles0
01

Company overview

Identity and operating footprint

Company typeRobot maker
Market segmentCorporate
StagePre-seed
FoundersJonas Wüst (CEO), Johannes Lienhart (CTO), Pragash Sivananthaguru (CCO)
Regions servedEurope, Middle East
Countries deployedCH, DE, DK
Service footprintHQ Zurich, Switzerland; European distribution partners include SepcoTech (Denmark) and SeaRenergy (Germany/offshore); pilot programs with 30+ customers in offshore wind, oil & gas, and EOD sectors; global order availability.
Last reviewed2026-07-05
MX

Robot models

Specifications remain vendor-claimed

Machineinspection

Tethys ONE

  • 35 kg operating weight; <10 minutes deployment (no support vessel required)

    vendor-stated operating weight and setup time from case to in-water

    Claim source
  • 300 m maximum operating depth; 400 m wired operational range

    vendor-stated maximum depth rating and tethered range

    Claim source
  • 3.5 knot (2 m/s) current tolerance for autonomous station-keeping

    vendor-stated maximum water current speed in which drone holds position autonomously

    Claim source
  • 4-hour runtime with hot-swappable lithium batteries; dual ROV/AUV operating modes

    vendor-stated endurance and operational mode flexibility for Tethys ONE New Edition

    Claim source
DP

Deployment log

Announced and cited only

AnnouncedCustomerSiteCountryCountEvidence
2025-10-16Aramco Europe (demonstration program)oil & gas inspectionCHNot disclosedAnnouncement
2025-05-28SeaRenergy Offshore Holding GmbHoffshore inspectionNot listedNot disclosedAnnouncement
2022-05-30Swiss Army EOD Command (armasuisse Science + Technology)government explosive ordnance disposal unitCH1Announcement
CA

Funding history

Publicly announced rounds

Investors on recordRedstoneAlpine VCEuregio+Zürcher KantonalbankETH FoundationKickfundVenture Kick
TL

Company timeline

Milestones and announcements

2026-02-18Aramco Europe completed successful Tethys ONE demonstration on Swiss lake; next step confirmed as deployment at Aramco facility in Saudi ArabiaTethys Robotics
2026-02-18Aramco Tests Tethys ONE ↗Tethys Robotics
2025-10-30Closed €3.5M pre-seed round led by Redstone with Alpine VC, Euregio+, Zürcher Kantonalbank, ETH Foundation, Kickfund, and Venture Kick; 30+ pilot customers, 1,000+ successful divesRobotics and Automation News
2025-07-29SepcoTech (Denmark) signed as new European distribution partner, expanding Tethys into Nordic offshore marketsTethys Robotics
2025-05-27Strategic partnership with SeaRenergy Offshore Holding GmbH for North Sea and Baltic Sea offshore wind and subsea cable inspection pilot projectsOffshore Technology
2024-08-22Unveiled Tethys ONE New Edition: fully redesigned with dual ROV/AUV mode, 35 kg, 300 m depth, modular payload system, hot-swappable batteries, and 4-hour runtimeTethys Robotics
2022-05-30Delivered first Tethys ONE prototype to Swiss Army EOD Command (armasuisse S+T): first commercial/government deliveryTethys Robotics
SC

Source ledger

8 unique public sources

01
Tethys Robotics secures €3.5 million in pre-seed funding to automate hazardous underwater operations (original €3.5M; ~1.11 USD/EUR at announcement)Robotics and Automation News · retrieved 2026-07-05
02
Tethys Robotics wins CHF 150,000 to enable automated inspection in rough watersVenture Kick · retrieved 2026-07-05
03
Underwater Drone: Tethys RoboticsTethys Robotics · retrieved 2026-07-05
04
Tethys ONE - New Edition: Tethys RoboticsTethys Robotics · retrieved 2026-07-05
05
Aramco Tests Tethys ONE: Tethys RoboticsTethys Robotics · retrieved 2026-07-05
06
SeaRenergy partners with Tethys RoboticsOffshore Technology · retrieved 2026-07-05
07
Delivery to EOD: Tethys RoboticsTethys Robotics · retrieved 2026-07-05
08
News: Tethys RoboticsTethys Robotics · retrieved 2026-07-05