Siljan Ring proved inconclusive. Drilling for natural gas was resumed in the late 2000s and continues as of mid-2012. The scientific premise for prospecting of this sort is based on the work of physicist Vladimir Kutcherov, who is cooperating with Igrene, the company financing the drilling operations. Siljan Ring The Siljan Ring () is a prehistoric impact crater in Dalarna, central Sweden. It is one of the 15 largest known impact craters on Earth and the largest in Europe, with a diameter of about . The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during
Swansboro Country Airport helicopter. Swansboro Country Airport was established in 1969 to transport real estate agents and their clients from the then-new Swansboro Country subdivision, the first rural subdivision in El Dorado County. The original airstrip, created by the US Forest Service, was expanded and is now privately owned, and use is restricted to property owners and their guests. During the 2014 King Fire, the airfield was used as a staging area for fire trucks, crew trucks and heavy equipment. Swansboro Country Airport Swansboro Country Airport is four air miles (6 km) northeast of Placerville, in El Dorado County, California. It is owned