Hull configuration
The operational limitations of most existing underwater machines when on the surface provided the motivation to find a more appropriate hull form. As a result, the “underwater boat” was introduced, which is intended to give the C-Questers and the C-Explorers the freedom to move around on the surface of the sea without the need of heavy and expensive support ships.

The underwater boat principle combines a polyester exo-structure with a separate pressure hull, which comfortably accommodates its occupants.

U-Boat Worx’ C-Quester 3 features a high-grade steel and acrylic sphere that are meticulously joined together to create the sturdy and pressure-resistant Main Pressure Hull. Contrary to the C-Quester 3, the C-Quester 2 and the C-Explorers are fully acrylic pressure vessels.
     C-Quester 3 personal submersible

 Personal submersible with 3 people going under

  Diving tanks
Diving tanks, filled with air on the surface, give a submersible the stability and freeboard needed to embark or disembark passengers safely from the vessel. Four independent polyester diving tanks are evenly positioned around the centre-of-gravity and centre-of-buoyancy to allow a graceful descent into the depths of the sea.

Buoyancy tank
A smart and intuitive buoyancy system is integrated into the C-Questers and C-Explorers to allow pilots to trim their submersible with great levels of accuracy. The need for support divers to carry around heavy trim weights can hereby be consigned to history.

 Private submersible descending

 C-Quester submersible propulsion system  

Propulsion systems
Two 3,000 metres depth-rated horizontal thrusters power the C-Questers and C-Explorers to a maximum underwater speed of 2 knots. It might sound slow, but you will learn that numbers are deceptive once you sit behind the controls. For vertical movement, two additional thrusters are brilliantly incorporated in the exo-structure’s design and give the submersibles the manoeuvrability they need in even the harshest of underwater environments.

Life Support Monitoring
Two independent industrial life support monitors are installed in the main pressure hull to monitor air quality for the well-being of the occupants. Oxygen and carbon dioxide levels are precisely measured. Audible and visual alarms are given to warn the pilot to take action if the prescribed threshold values are exceeded.




Tourist submersible  

Extended Life Support Capabilities (96 hours)
Exceeding standards of various classification authorities, U-Boat Worx has designed the C-Questers and C-Explorers with a 4-day life support reserve, which includes oxygen, carbon dioxide absorbent, food and water supplies. This complies with the internationally acknowledged guidelines of the International Maritime Organisation.

Communication & Tracking
Communication between the submersible and the surface is essential to the submersible’s operation. Two acoustic transducers send and receive the voice signals and are received on the onboard or topside communication unit.

Various tracking and tracing systems can be installed on the submersible, which can be divided into two categories: USBL and dead reckoning. The first method, tracks the submersible from the surface using triangulation in conjunction with a transponder on the sub. The second method uses an advanced sensor, which measures the movement of the submersible underwater in order to display its path.
   Luxury submarine for personal use
    Safety Devices
There are various ways to ascend. You can use the electric thrusters, blow the ballast tanks with air and lastly there is a drop-weight situated on the bottom of the hull. Once this is released, the sub will start to ascend.

For safety, all submersible models are equipped with a safety buoy attached to a 150 m rope, which will shoot up from the sub in an emergency. There is a Pinger system on board, which will emit a signal every second. This will make it easy to trace the sub under water.
One Atmosphere
The possibility of sharing the feeling of being submerged with someone, and to be able to talk is a great advantage over SCUBA diving, as is the fact that you don’t need any experience. You’re in a one-atmospheric pressure hull, so you don’t have to worry about decompression or getting wet!
   Passenger in luxury submersible on Monaco Yacht Show


Lithium-Ion Battery Technology
Unlike most other submersibles with lead-acid batteries, the C-Quester and C-Explorer submersibles use the latest in Lithium-Ion Battery Technology. U-boat Worx has made considerable investments in the Lithium-Ion technology to provide longer operational endurance and extremely rapid recharging. The maximum dive time depends very much on the way the submersible is operated, as well as the power consumption of peripherals, like for example the air-conditioner and manipulator arm. Normally a good 6 hours should be no problem in full speed circumstances. With the operational 42 kWh battery pack upgrade that is available for the C-Explorers, the capacity can even be doubled.

Comprehensive air- conditioning system
An exclusive experience like a personal sub ride should be offered in complete comfort. This is why U-Boat Worx has installed an air conditioning system that will cool you off immediately, which is possible as a result of the use of Lithium-Ion batteries. This will ensure a comfortable and non-humid atmosphere in the sub. Unlike many other subs that use fans or other inefficient system, this will really keep you happy.
Advanced touchscreen system
This system gives a clear overview of all the information needed for safe and easy operation of the submersible.
The system provides data on depth, internal pressure, temperature, battery status, thruster status and trim tanks status. This advanced touchscreen system also makes remote troubleshooting undemanding. All information downloaded to a standard USB stick for further investigation.