Octopus Harald - Marine Accident Investigation Branch

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ORKNEY ISLANDS -Northern PartGrounding positionFigure 4Reproduced from Admiralty Chart 2250 by permission ofthe Controller of HMSO and the UK Hydrographic Office1 Nautical milePassage 08/09/06Passage 07/09/06Approximate route taken by Harald/Octopus prior to groundingGrounding 1755 8/9/06Height of tide 0.5m6
Figure 5Octopus agroundOctopus refloated 40 minutes after the grounding, and was returned to Hatston Pier inKirkwall where all four legs were found to be damaged. The damage to the barge costan estimated £1m to repair. The delay in returning Octopus to Seal Skerry Bay alsoresulted in extensive delays to the project when the seabed frame, constructed duringthe initial installation stage, collapsed in the strong tides.Following the grounding, the UKHO initiated NAVTEX warnings of the shoal danger inthe area. A week after the grounding, the Orkney Harbour Authority pilot boat carriedout a survey of the area, which confirmed the presence of an uncharted shoal area witha minimum depth of less than 8m, the bank covering an area of approximately 2.5 x 2.5cables.The MCA, UKHO and the Shetland Coastguard were advised of the survey’s findings,and the area of the grounding was subsequently re-surveyed by the MCA’s EmergencyTowing Vessel (ETV) Anglian Sovereign. The more accurate survey data obtainedduring this survey was used to generate the chart correction data issued in AdmiraltyNotices to Mariners (NTM) Week 41, published on the UKHO Web site on 5 October2006 and in paper format on 12 October 2006. The revised charted depth in thelocation of the grounding was shown in the NTM as 7.1m (Figure 6).7
Page 1 and 2: Report on the investigation of the
Page 3 and 4: CONTENTSGLOSSARY OF ABBREVIATIONS A
Page 5 and 6: IHMC - International Hydrographic M
Page 7 and 8: SYNOPSISThe jack-up barge Octopus w
Page 9 and 10: 1.2 PARTICULARS OF OCTOPUS AND ACCI
Page 11: 1.3.2 The voyageAt 1300 on 8 Septem
Page 16 and 17: Figure 7Admiralty Chart 2250 before
Page 18 and 19: Reproduced from Admiralty Chart 225
Page 20 and 21: Figure 10MCA Survey following groun
Page 22 and 23: 1.6.3 Category of Zone of Confidenc
Page 24 and 25: 1.7.3 ResearchIn 1997, the Departme
Page 26 and 27: 1.7.6 CHP survey effortAll survey w
Page 28 and 29: 1.8 INTERNATIONAL HYDROGRAPHIC ORGA
Page 30 and 31: SECTION 2 - ANALYSIS2.1 AIMThe purp
Page 32 and 33: 2.4.5 Decision to divert west of Li
Page 34 and 35: 2.7 CRUISE SHIPS AND OTHER DEEP DRA
Page 36: SECTION 5 - RECOMMENDATIONS2007/165

Octopus Harald - Marine Accident Investigation Branch

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