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UNEXPLODED ORDNANCE


FEATURE SPONSOR


CLEARING UXO CONTAMINATED AREAS


SeaTerra surveys and clears UXO contaminated areas on land and on water. The German company are specialists in wind energy and approximately 10,000 hectares of seabed in the North and Baltic Seas have successfully been investigated and declared free of unexploded ordnance (UXO).


In the course of these investigations some 4,000 suspicious objects were uncovered, identified and recovered; 160 pieces of UXO (sea mines, bombs, shells) were found, recovered or relocated and 50 not transportable sea mines had to be detonated underwater.


FURTHER PROJECT DETAIL GEOPHYSICAL SURVEYS


As part of the ordnance investigations, 160 major unexploded ordnance targets (UXOs) were identified. The largest part (e.g. grenades or partly destroyed mines) were classified as transportable and salvaged from the seabed. Usually these UXO are handed over to the Ordnance Disposal Authority, who are responsible for the disposal.


The non-transportable ordnance (50 items, mostly sea mines) were


The ordnance clearance operations were preceded by comprehensive geophysical surveys. Approximately 10,000 ha of the seabed were surveyed with high-resolution magnetometers and partially with Side Scan Sonar, Multibeam Echo Sounder and Sub-bottom Profiler systems. Subsequent data interpretation led to the identification of thousands of anomalies. The company identified


demolished in situ by explosives specialists and ordnance divers. All demolitions were thoroughly prepared and designed in close cooperation with the responsible regulators. Marine mammals were protected by scaring devices and a ‘Big Bubble Curtain’ to minimise noise.


around 4,000 potentially dangerous objects and investigated and cleared them with the help of remote-controlled devices (ROV, airlift), cranes and ordnance divers.


SPECIAL FEATURE


A special feature was the geophysical investigation within the 500m safety zone of the existing converter platform DolWin alpha. The work was carried out under the highest safety requirements and only under ideal weather conditions.


SeaTerra


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www.windenergynetwork.co.uk


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