It follows the completion of work to repair and reinforce the harbour berth.

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"Once we figured out a basic strategy, we could apply that strategy across the board, and we burned through the majority of the contest just applying these basic techniques, which could work in the field too, " Harbour said.

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Capt Iain Greenlees, who is in charge of the project, said the work would build on existing understanding of the geology of the harbour and its approaches.

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The collapsed, failed states that harbour terrorism are exactly the places where large-scale foreign aid does not work.

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South West Trains (SWT), which is operating a reduced service of two trains an hour to Portsmouth Harbour, said it shared passengers' frustration and was "pressurising Network Rail to complete the work as quickly as it can".

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During the survey work, an underwater microphone called a hydrophone will be used to record the high frequency sounds of harbour porpoises and white-beaked dolphins for analysis.

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