£15.4 Million Contract For First Cutting-edge Navy Crewless Submarine

2nd December 2022

Project Cetus will deliver the largest and most complex crewless submarine operated by a European Navy.

A £15.4 million contract for a cutting-edge crewless submarine has been awarded to Plymouth firm MSubs by the Royal Navy. The vessel will be delivered to the Navy in two years' time and will further advance the UK's ability to protect our critical national infrastructure and monitor sub-sea activity.

Project Cetus - named after a mythological sea monster - enhances the Royal Navy’s experimentation with autonomous underwater systems. It is the first step in developing an operational autonomous submarine that will work side-by-side with crewed submarines – including the Astute-class hunter-killers and their successors – or independently.

Its maximum operational depth will exceed that of the current submarine fleet, meaning Cetus will equip the Royal Navy with even greater reach into the oceans in support of UK defence. It will be able to cover up to 1,000 miles in a single mission.

Cetus will be 12 metres long – the length of a double decker bus – 2.2 metres in diameter and weigh 17 tonnes. It will be the largest and most complex crewless submersible operated by a European navy. The bespoke vessel is being designed and built for the Royal Navy by Plymouth-based tech firm MSubs. This contract will create 10 and support 70 specialist jobs in the city.

Defence Secretary Ben Wallace said:
In order to meet the growing threats to our underwater infrastructure, the Royal Navy needs to be ahead of the competition with cutting edge capabilities. Project Cetus, alongside bringing forward the MROS ships, will help ensure we have the right equipment to protect the security of the UK and our Allies.

Having the skills base and specialist knowledge to develop and build this vessel in the UK, is testament to the UKs leading reputation in building surface and sub-surface ships.

The vessel’s size means that it will fit inside a shipping container and can therefore be transported around the world to wherever it is needed. It will be designed to operate with all of the ships from the Royal Navy fleet as well as those of our allies.

Cetus will be a platform for the Royal Navy on which to experiment and build cutting edge technologies and capabilities around, encouraging innovation and developing best practice. The unarmed vessel is battery powered, meaning its effective range can be increased by installing additional batteries.

It has also been designed to be modular, with an optional section that can be added to double the capacity of the vessel.

The crewless submarine is the latest step taken by the Royal Navy into autonomous systems, and have been for over a decade. Crewless minehunting systems are already operating in Scotland, and driverless Pacific 24 sea boats are undergoing testing. Various aerial drones are used by ships for reconnaissance and intelligence gathering.

The Navy has invested in a dedicated tech trials ship, XV Patrick Blackett, to assess and test new equipment and determine how it could be used or integrated into the fleet. Cetus is the equivalent for sub-sea experimentation.

First Sea Lord Admiral Sir Ben Key said:
This is a hugely exciting moment for Project Cetus as the Royal Navy surges ahead with the development of autonomous technology.

This Extra Large Autonomous Underwater Vehicle is a capability step-change in our mission to dominate the underwater battlespace. And I am delighted that the project is able to support a small, innovative UK company which is at the cutting edge of this sector.

The contract is funded by the Anti-Submarine Warfare Spearhead programme, run by the Royal Navy’s Develop Directorate, headquartered in Portsmouth. The vessel will be delivered through the Submarine Delivery Agency in Bristol and is the latest in a series of novel underwater technologies being brought to life to deal with the threats of the next decade.

Brett Phaneuf, Chief Executive Officer at MSubs said:
The faith the Royal Navy has shown in our small business is humbling and we look forward to working closely together in the future, as we have in the recent past, to develop and deploy Cetus, in the national interest.