Page 4 bottom of the bay and become effectively isolated from the inhabitants in the area. And third, the clean-up operations which had already taken place were not completed until the end of March, which left only a few weeks before the ice would become unsafe to work on. Many environmental surveys have been conducted by Danish scientists in the years since the accident. These surveys have focused on determining the levels and distribution of plutonium contamination in the marine environment and investigating the possible impact that might be transmitted through the food chain to the Greenlanders (see Figure 2). The surveys have produced the following major conclusions: 1. The inventory of plutonium in the sediment on the bottom of the bay is about 30 Ci. The maximum concentration under the crash site is about 50 pCi/g (see Figure 3). The vertical displacement of the plutonium is about 7-8 mm/y which indicates that it will become increasingly unavailable to the biota in the sediments. 2. Plutonium has been found in increased quantities (up to 6 pCi/g) in the organisms (mussels, starfish, and shrimp) that live in the sediment, but the concentrations are decreasing with time. 3. Certain seaplants have been found to concentrate plutonium by a factor of about 13,000.