On behalf of the Swedish Armed Forces, FOI NBC-skydd and MCN (the North Sweden Soil Remediation Centre) have jointly conducted a feasibility study regarding methodology for remediation of the foretunnels and dry docks at the Muskö Naval Base. In one of the foretunnels, the so-called FriGeo Technique has been employed, i.e. polluted sediments are removed by freeze dredging. In dry dock 1 concrete samples were taken from wall surfaces previously treated in one of the following ways; washing under pressure, vacuum-cleaning or no treatment at all (control surface). The results of the investigation showed that the sediments require remediation. A conventiona course of action could be that of dredging or excavation and emptying of the foretunnels; an alternative could be that of employing the FriGeo-technique. In any case, the sediments will need to be dewatered and the water filtrated prior to returning to the recipient. For economical reasons, the remediation measures taken should be in sequence, since the costs for equipment set ut are relatively high. The transportation fo the dewatered sediments to SAKAB is probably the only realistic method for final treatment. Prior to remediation of the foretunnels, walls and floors of the dry docks will need to be cleaned, preferably by the use of a vacuum-cleaner. The noise absorbents should also be replaced at this point.