Assessment of road tunnel options between Malta and Gozo

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Assessment of road tunnel options between Malta and GozoTransport Malta said today that, following Cabinet approval, the Ministry for Infrastructure, Transport and Communications has instructed Transport Malta to commission detailed feasibility studies on a road-tunnel link between Malta and Gozo.

“This follows expert findings that in principle, and on the basis of a preliminary and high level review, a road link is technologically doable and may be economically feasible.”

In July 2011, Transport Malta appointed Mott Macdonald to carry out a preliminary analysis of road tunnel link options between Malta and Gozo. The assignment was secured as part of the EU JASPERS program of technical assistance to Malta.

The purpose of the five month study was to provide a list of technical, engineering, environmental and economic issues relating to potential sub-sea tunnel fixed-link options connecting Malta and Gozo. The study presents a high level analysis of different tunnel options based on existing data, studies, information, site visits and various discussions with stakeholders.

The final report:

Presents a background review and a list of key issues identified during consultation with the various stakeholders;

Provides a broad economic assessment of introducing a fixed link between Malta and Gozo; Identifies four potential tunnel alignments for further investigation;

Presents a high level environmental assessment of each of the four tunnel route alignments.

The number of vehicles crossing between Malta and Gozo has increased at 4.1% per annum between 2000 and 2010. In 2010, there were an average of 1,500 vehicles per day /direction and 5,500 people per day/ direction travelling between Malta and Gozo.

The introduction of a fixed link would reduce average journey times between Gozo and Malta by at least 40 minutes.

Four potential tunnels alignments have been assessed at a preliminary, conceptual level ranging in length between 6 and 10 kilometres depending on their depth and structural design..

The four tunnel alignment options take into account the engineering and environmental constraints that consultants were able to identify using existing data and information.

A detailed geological and geotechnical investigation is still required to determine more precisely the tunnel alignment, tunnel form, cost and construction methodology.

The location, geology and characteristics of the project (contractual, economic, market conditions, regulatory requirements, working practices and local environmental conditions) can have a significant effect on the cost of the tunnel. In this respect, the consultants have estimated costs for the construction of the four different tunnel option alignments based on a case history review of different tunnel types around the world.

Based on the reviewed case studies, the range of costs (in 2010 prices) estimated for the construction of the fixed link is wide and would depend on ground conditions and other circumstances. The consultants have estimated a range of costs for each tunnel alignment option between €156m for a single-bore 3-lane bi-directional tunnel right up to €1080m for a twin-bore 2-lane uni-directional tunnel.

The cost estimate for each option would need detailed verification following details studies of the short-listed options and would be subject to detailed reviews of economic and environmental considerations.

The Consultants found that:

With regard to the overall length, depth, configuration and size of tunnels an undersea tunnel link between Malta and Gozo would be technically feasible and does not exceed the capability of modern technology;

The geology of the area is potentially complex and not well documented. A detailed geological and geotechnical investigation is required to determine the optimum tunnel alignment, construction methodology and more detailed estimates of construction costs;

The typical construction stage for a tunnel of this nature would be approximately 5 to 7 years, but this average duration is strongly dependant on the geological environment;

A road tunnel link between Malta and Gozo could potentially be co-financed by the European Union under the Cohesion Fund;

The securing of external financing for the construction of a fixed link between Malta and Gozo would require a full feasibility study. Consultants advise that no external funding would be considered without a comparative assessment of other options to verify what is the most economically and environmentally advantageous way to link the islands. The full feasibility study and environmental impact assessments would also be required to assess the following different Malta-Gozo transport options:

Bridge and/or viaduct; Bored and/or immersed tube tunnel; Combinations (e.g. bridge and tunnel); Other fixed links (e.g. combined/tidal barrage; railway; etc.); Retention of existing ferry service and/or its service expansion; Other transport services (air, sea); Other measures (demand management, travel behavior change and similar).

A full feasibility will require among other things detailed geological and geo-technical investigations including full geological mapping, geophysical investigations and core drilling, detailed designs, environment impact and risk assessments.


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    9 Responses

    1. Lesley Kreupl says:

      Would you travel in a tunnel built and run by the same people who care for our roads?
      No further comment is necessary….

    2. Mark says:

      General Election is coming ,this is the same BOMBA promise that we had been promised for SMART CITY .

      Can Austin Gatt explain what happened to Smart City ?? No one can believe these hollow promises anymore.

      Just forgot ,When shall we hear the we struck oil??

    3. James A. Tyrrell says:

      I would be a bit concerned to say the least if Transport Minister Austin Gatt had anything to do with the proposed tunnel as he seems to screw up everything he touches. Even without Austin Gatt’s involvement the very idea of Transport Malta being involved is worrying given the state of the roads on dry land. I think that if any tunnel work is going to be carried out it should be handed to a Norwegian tunnelling team who would have the necessary expertise to do the job right, probably do it at less cost, and there would be less chance of funds being diverted to any of the Government’s developer friends.

    4. angelo xerri says:

      @ Mark Have you noticed that one of the proposals passes through Hondoq,Austin Gatt said that if there environmental problems they will be taken into account.

      Wishful thinking Austin if PN will be re elected they will do whatever suits them

    5. Dietmar Treptow says:

      Co- financed is the word what is opening all doors .
      We do not need a tunnel or bridge ! Spend the money in the roads and other important things !

    6. peter paul says:

      Castles in the air .That`s what this proposal is just like Smart City .

      Promises,promises,promises and more promises prepare for more to come .I wouldn`t be surprised if we will strike oil

    7. jenny anne says:

      does anybody sane really believe this can happen? – would you travel in a tunnel built by the same people who mend our roads? at least with the ferry service we are above ground! but – no – let’s waste even more public funds on feasibility studies and environmental impact assessments just to show what big players we really are…….

    8. Anthony Grech says:

      Yes it can happen,if the goverment not the people put their heads together.Do you think that this big venture is going to be in the hands of the Maltese people? Are there big enginers in Malta that can do this work? I do not think so. Yes there are lots of people afraid to go in a tunnel under the water,but I can only say,that in my opion they do not want this or any other thing to happen in Malta. Shame on them. Get over it. This should have happened a long time ago.

    9. Jason says:

      @ Anthony Grech .This should have happened long time ago .Of course I do agree with you 100% BUT

      1 Why has Fenech Adami signed the building of three Gozo Channel ships on the eve on a general election

      2 Why was Mgarr terminal done if now we want to do these tunnels ?

      3 Why is Cirkewwa terminal being built at a very fast pace ?

      I am not saying that these three projects are not good far from it ,but if this current government had a real vision he should have assessed these tunnels idea well before all these projects were even considered

      If this tunnel will ever sees the green light what will happen to Gozo terminal,Cirkewwa terminal and also to the ships ? Like what has happened to the Helicopter terminal abandoned and falling into pieces?

      I do really believe that this is all bluff before the general election like Smart City .

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