Vessel in Hull-Up high speed transit mode. Vessel in Hull-Up high speed transit mode.
Vessel in Hull-Down stationary/slow speed stable mode. Vessel in Hull-Down stationary/slow speed stable mode.
SHC Wavedancer 3D model in is under development. SHC Wavedancer 3D model in Hull-Up Transit mode.
(Animation currently under development).
SHC Wavedancer 3D model in is under development. SHC Wavedancer 3D model stern view.
SHC Wavedancer 3D model in is under development. SHC Wavedancer 3D model in Hull-Down rough weather or working mode.
SHC Wavedancer 3D model in is under development. SHC Wavedancer 3D model in Hull-Up Transit mode, under hull view showing bracing fitting into superstructure underside.
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Rough Seas?           No Problem!

Hull-up for fast transits - Hull-down for the stability of a semi-submersible.

Partners and Investors

There are a few opportunities for partners and/or investors with the right contribution at this stage of the project, which is the initial design and testing of the concept.
There are so many applications for this concept, in both mono and multi-hull vessels, and it is scalable from small inshore vessels to supertankers, so there are opportunities within a number of maritime sectors.
The first sector we are targeting is the Offshore Wind maintenance market with the SHC Windancer which will be a large 'Mother Ship' with small boats for calm weather maintenance and capability to remain on site and work in rough weather.
Some low level investment opportunities do exist, however we welcome enquiries from major investors for the build stage where considerable investment will be required.
There are also opportunities to partner with companies or individuals that have the expertise, skills or capabilities to take this forward.
Also we would like to include a student who may be looking for a thesis subject for a Naval Architecture degree.
If you have something to offer in any of these categories please contact us.

Our Story

About The Submersible Hull Concept.

Greatly increase weather workability and reduce transit times.
Waves affect the water column to a known extent.
The top one third is where most of the energy is. The bottom one third has a little residual energy. To stop a ship from moving in rough seas one must put the superstructure above the wave tops and the hulls below the wave energy.
That is what a submersible hull vessel does. It allows the high energy wave to pass between the hull and the superstructure significantly reducing vessel movement and greatly increasing workability while maintaining the capability to travel at normal passage speed and have access berth normally in a port.
One design for the concept, the Submersible Hull Catamaran has the characteristics of a high speed ferry, allowing very fast transit times (around 50 knots or 90Km/h) but stable workability in rough conditions (about 5 m or 15 ft seas).
An ideal vessel for use in the offshore industry, both for oil and gas and renewable energy.
United Kingdom patents pending (GB 2489935).
International patents applied for (WO2012/136980).

Technical Data


Possible Uses Include:

  • Maintenance of Wind Farms in 90% of weather conditions.
  • Full field platform crew changes (dispense with helicopters).
  • Cable laying - work in 90% of the weather.
  • Hydrographic and Geophysical surveys, slow speed stability.
  • General platform re-supply.
  • Small diameter reel pipelay in 90% of weather conditions.
  • Placement of light lifts on the seabed.
  • Installation of wave or tidal arrays.
  • Emergency access to stricken vessels in rough weather.
  • Rapid response for oil spill containment.
  • Scientific research.
  • Installation and servicing of telecommunications cables.
  • Drill rig support and drill pipe carriers.
  • Weapons platforms for military uses.
  • Helicopter carriers.
  • Accommodation vessels for hook up and commissioning.
  • 2D, 3D or OBC seismic surveys.
  • Oceanographic research and equipment deployment / recovery.
  • ROV inspections services.

Keep working in most weather conditions; Save Time! Save Money!

About Us

Photograph of Dennis Knox

Link to Dennis Knox's Linked In profile.

Link to OSSeas Consulting website.

Dennis Knox.
Consultant - Offshore Energy, Oil and Gas Installation and Construction.

Senior manager with extensive experience in the oil, gas and energy industry and worldwide experience.
He is the Managing Director, and founder, of OSSeas Consulting, an experienced based senior consultancy to the offshore energy construction and installation industry.
Dennis has been a mariner for forty years, and for the last twenty four years has been in the offshore oil gas and energy installation and construction industry and engaged on more than forty project in almost every sea area of the world. He has been involved in some of the worlds largest oil and gas projects.
An entrepreneur and inventor the Submersible Hull Vessel Concept is just one of his inventions for which the patent is held by OSSeas Ltd.
Photograph of Colin Smith

Link to Colin Smith's Linked In profile.

Link to CS Marine website

Colin Smith.
Marine Advisor.

B.Sc (Hon), Ship Science. (Southampton University)
H.N.C. Naval Architecture (Mid-Kent College, Medway)
Royal Institution of Naval Architects (MRINA)
Institute of Marine Engineering, Science and Technology (MIMarEST)
Institute of Chartered Engineers (CEng)
An experienced professional with a wealth of knowledge both practical and theoretical obtained within the Maritime industry. Experienced in many facets of the maritime industry including Statutory requirements, Classification rules and regulations, P&I surveys, Superintendency and New building project management, prototype cruise ship projects, pre and post contract negotiations and repairs, modifications & conversions.
Photograph of Albert Sedlmayer.

Link to Bruce Laird's Linked In profile.

Link to Sedlmayer Associates website.

Albert Sedlmayer.
Naval Architect.

Founder, director and Naval Architect at Sedlmayer Associates Pty Ltd, (Australia), Developing super-yacht designs, incorporating hydro-dynamic, structural and aesthetic optimisation, ship design contracting and marine consulting.
With over four decades experience in the design of boats, yachts, ships, complex ship-board and marine structures, and architecture, Sedlmayer Associates Pty Ltd resolves design challenges to the highest design efficiency, optimising aesthetics, performance, function and structure to client's requirements.
The Society of Naval Architects and Marine Engineers.
The Naval Architectural Society (New Zealand).
Past founding Co-director of the Maritime Referral Group Ltd.
Photograph of Bruce Laird.

Link to Bruce Laird's Linked In profile.

Link to Astwood Law website.

Bruce laird.
Legal Advisor.

Senior Partner at Astwood Law in Redditch, U.K.
Bruce was originally from New Zealand where he practiced as a Barrister and Solicitor.
Bruce brings a wealth of knowledge and experience in legal issues and contracts, both under U. K. law and internationally.
Bruce received his degree from the University of Auckland, New Zealand and later conducted research at Institute of Advanced Legal Studies, University of London.

Contact us



Personnel Transfer System

The personnel transfer system on the stern of the vessel is based upon STL Research's 'Neptune' system.

STL Research Ltd Logo and web link.

Small Service Catamarans

The four small service catamarans depicted on the deck are based upon Safehaven Marine's 'Wildcat 53'.

Safehaven Marine logo and web link.

©OSSeas Consulting 2012

Grapic Art image of  stylised waves.