June 4, 2021


The tup diving system™ is a closed bell diving system, designed and built by n-sea. It is certified and operated in accordance with international maritime contractors association guidelines and codes of practice for offshore diving operations.

N-Sea initially created the innovative TUP Diving System™, system in 2007. This closed bell system exists to increase both workable bottom time and diver safety. In 2014, N-Sea demonstrated its on-going commitment to the future of the upstream industry by further upgrading the TUP Diving System®, resulting in a complete refit over the past 12 months.

By creating the TUP Diving System™, N-Sea has bridged a crucial gap between saturated diving and air/nitrox diving by providing clients with efficient and effective control of what is perceived as a high-risk operation.

The complete upgrade and refit of TUP Diving System™, over the past 12 months has resulted in the following innovations:

  • Uniquely, the system can now adapt to three types of gasses, suitable for three dive depth ranges. This increases the bottom time available to divers by over 60% – otherwise only possible through full saturation diving.
  • The exclusive use of three gas combinations also reduces the perennial potential hazard of diver gas toxicity.
  • TUP has been converted to allow it to be used as a mobile system, deployable from most DPII support vessels and platforms

Increased Safety

  • The potential hazard of gas toxicity is always present in diving and the TUP Diving System™ recognises this safety issue has also traditionally led to less than optimal efficiency.
  • The System provides a unique level of splash zone protection, allowing N-Sea to undertake work in weather conditions usually deemed unsuitable for diving activity. In many situations, the TUP Diving System™ also negates the requirement to deploy a saturation dive vessel and the additional costs and complexities that deployment can bring.
  • The TUP Diving System™ acts a subsea decompression chamber, to be raised from the seabed. During this process, decompression begins. Vitally, there is no exposure to atmospheric pressure during decompression as divers move into the chamber.  Traditional surface decompression techniques exposes divers to atmospheric pressure prior to the start of decompression.  This exposure has always been a point of contention with this particular technique

Increased Diver Efficiency

  • The upgrade of functionality allows divers to spend up to 63% longer on the seabed – uniquely efficient and cost-effective in terms of closed bell diving systems.
  • Team cross-over through on-board decompression can save significant time and contributes to the efficiency of the TUP System.

Swift Mobilisation

  • Producing the same results as a full saturation dive system, the TUP Diving System™ can now be mobilised on DPII support vessels, platforms or rigs, and the unit can be deployed within 24 hours of reaching the quayside.  Very few subsea diving systems can offer this level of mobility and versatility, making it a uniquely efficient solution for a wide variety of subsea projects as the upstream industry responds to future challenges.

Whilst the TUP is currently utilised in a subsea Inspections, Repair and Maintenance capacity within the North Sea, it is ideally suited to shallower waters and high tidal areas where traditional forms of air diving have required multiple dives in order to complete a project.  This indicates that, for example, drilling from a drilling rig in an area such as the Southern North Sea will benefit from the maximised bottom time provided by the TUP Diving System™.


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