The Arctic still has unmapped and unknown areas. In particular, there is the continental shelf that extends out from the American and Canadian northern lands. Who controls it? Who has the right to drill for example which then leads into the complicated morass of environmental rules and controls. American and Canadian scientists are setting sail this summer to map the Arctic seafloor and gather data to help define the outer limits of the continental shelf. Each coastal nation may exercise sovereign rights over the natural resources of their continental shelf, which includes the seabed and subsoil. These rights include control over minerals, petroleum, and sedentary organisms such as clams, crabs and coral.