* The Tethys Ocean (Greek: Τηθύς) was an ocean that existed between the continents of Gondwana and Laurasia during much of the Mesozoic era, before the opening of the Indian and Atlantic oceans during the Cretaceous period.

Unmanned sea drone capable of
removing surface contamination in
non open sea areas

Surface contamination

is a common phenomenon in medium-wave water- areas, such as marinas, lakes, ports and bays. This problem is mainly caused by common rubbish such as trash, paper, cans, bottles and natural materials like wood and cane, not to mention liquid contaminants as oil. In addition to this, sea foam and occasional changes in the substance of water are phenomena that need to undergo an analysis in order to be constricted.

The aim of Tethys is triple:

the purification of the surface of low-wave water areas,
the collection of useful information about the water quality with the usage of sensors and
microbiological analysis and a first level constraint of water contamination


boasts an array of cutting- edge technologies that render it a pioneer in the field of USV (Unmanned Surface Vehicles). It is made out of polyester and its shape reminds of a sea turtle. The front part of Tethys bears a mouth- intake which absorbs the solid and liquid waste. Afterwards the collected waste is transferred into a bin container, at the back side of Tethys, with the help of an abstraction mechanism which is placed in its interior. The solid waste remains in the bin container 80 liter capacity whereas the liquid waste ends up into the water area. At the entrance point of the container bin, a sensor alerts about its occupancy. On each occasion the occupancy of the container bin approaches 95%, the craft returns to its base in order to empty the content of the bin.

In order to detect infectious flecks on the water surface such as oil, Tethys boasts sensors that determine the type of the fleck. Afterwards the fleck can be faced in two different ways: either via biodegradable microorganisms which are stored into tanks of the craft or with the use of filters that filter out the water that comes into it.

Another special feature of Tethys is its sensors, which are destined to collect useful data about the quality of the aquatic ecosystem. These sensors are capable of providing information about the pH levels and the temperature of water; they control the biochemical features that determine its quality as well. The collected samples of water are stored in special vials in order to undergo a further analysis in specialized laboratories.

icon xelona tethys

Furthermore, the craft boasts two cameras: the first one supervises and registers data about the water-surface and the second one provides a clear image of the bottom. The cameras facilitate the user both to supervise the action area of Tethys in real time and to take pictures or record a video for the purpose of a further analysis. In addition to this, Tethys enables the discovery of objects responsible for water contamination such as tires, furniture, barrels etc., thanks to an integrated scan- device.


moves with the aid of an electrical motor or rechargeable battery. The photovoltaic located on the top of the craft not only contributes to the charge of the battery but provides energy to secondary functions as well.

Tethys can be controlled either with a remote control or via a mobile phone application, which utilizes a global positioning system (GPS). This application empowers the user of the craft to determine the action area (Geofence- virtualborders) on the map (googlemaps) and then move it towards a specific place. The motion sensors ensure a safe voyage, preventing any possible crash.

A mix of cut-edge technologies destined for environmental protection


Call Us