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ROV SuBastian: see the characteristics of the submarine “robot” that explores the oceans at a depth of 4.5 km.
Exclusively designed for science, the ROV SuBastian is a remotely operated underwater vehicle that can reach up to 4,500 meters below the sea surface. Developed in 2015 by Californian engineers and officially launched in 2016, the robot belongs to the Schmidt Ocean Institute — a philanthropic organization focused on the scientific exploration of the oceans — and operates from the research vessel RV Falkor. In more than 400 dives conducted around the world, the equipment has enabled discoveries that would be impossible without it.
Physical structure of the ROV SuBastian
The SuBastian has dimensions similar to a compact car: 2.7 meters in length by 1.8 meters in width and height. Despite the relatively contained size, the vehicle weighs 3,200 kilograms — a mass necessary to support the entire structure of scientific equipment it carries.
To ensure the robot floats in a controlled manner during the dive, its structure is covered with syntactic foam, a lightweight material resistant to the extreme pressure of ocean depths. This buoyancy property is essential for the vehicle to remain stable during operations.
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Propulsion and movement system
The movement of the SuBastian underwater is achieved by five thrusters working in coordination. The distribution is as follows: one thruster is dedicated to lateral movement, two control the forward and backward movement of the vehicle, and the other two are responsible for vertical movement — that is, ascending and descending during the dive.
The navigation speed varies between 0.5 and 3 knots, a maritime unit of measure equivalent to 1.852 km/h each. The pace depends on the depth at which the robot operates and the intensity of ocean currents at the time of the mission.
Connection with the ship: the umbilical cable
SuBastian does not operate autonomously. It is connected to the RV Falkor via a highly flexible and durable umbilical cable, which performs two functions at the same time: it transmits electrical and optical signals between the ship and the robot, ensuring real-time communication and control throughout the dive.
To prevent the cable from getting tangled in the ship’s propellers — which could compromise the entire operation — the system features a cantilever mechanism. This engineering solution manages the tension and angle of the cable throughout the mission, maintaining the equipment’s safety.
Onboard operation: each dive requires at least two specialized pilots on the ship. The average duration of missions already carried out is about 8 hours, but there is no defined technical limit for how long the ROV SuBastian can remain submerged.
Scientific capabilities of the ROV SuBastian
One of SuBastian’s main features is its adaptability. The vehicle can be equipped with different sensors and scientific instruments according to the objectives of each expedition, making it useful for a wide variety of research. Among the functions the robot is capable of performing are:
- Recording high-resolution 4K video for visual documentation of the underwater environment
- Collecting biological, geological, and seawater samples at different depths
- Detailed mapping of the ocean floor’s relief and structures
- Physical-chemical characterization of the water, such as temperature, salinity, and pressure
- Production of photomosaics — large-scale photographic compositions of the seabed
- Deployment and recovery of scientific equipment left in the ocean
From construction to the first dives
The SuBastian project was initiated in 2015 by a team of engineers based in California. The construction took about 18 months, and before any open sea operation, the vehicle underwent tank testing at the Monterey Bay Aquarium Research Institute in the United States.
The first deep-sea dive occurred in 2016, near Guam, in the Pacific Ocean. Since then, the ROV SuBastian has accumulated more than 400 missions around the world until 2020, allowing researchers to access remote regions and identify new species and geological formations still unknown to science.
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