The radiological consequences and transboundary exposure were evaluated including uptake in biota and radioecological modelling. The results created a more precise knowledge of long-term effects on environment and man from past and present sources and a more informed debate on waste management of controlled releases of radioactivity in the marine environment. Important objectives were to enhance European competence in the field of environmental radioactivity, encourage the transfer of skills, provide training and increase mobility for younger scientists. The REMOTRANS project provided a basis for informing the public, the news media and politicians of current development and may prove to be of special value in emergency situations. The study of the mechanisms for remobilisation and of bio-availability of remobilised radionuclide species was an innovative approach which has lead to a more robust understanding of marine environmental radioactivity. The multinational collaboration made it possible to reach and perform sampling in different European marine environments. The overall objective of the project was achieved through a programme of work which follows the following steps: -A sediment sampling and analysis programme leading to improved knowledge of inventories and quantifying potential sediment source terms. -Time series measurements of radionuclides at key locations to quantify transport rates and transfer factors. -Develop a protocol for and perform determination of physico-chemical forms of the radionuclides in order to assess their potential remobilisation ability. -Perform laboratory experiments to assess the impact of remobilisation on bioavailability. -Develop radioecological models taking remobilisation processes into account.