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
Mora–Siljan Airport The number of passengers fell dramatically from about 50,000 passengers per year in the 1980s to 7,000 in recent years, following a trend experienced during this period by all Swedish third-level airports. Cutthroat competition between two domestic airlines, Skyways Express and the defunct European Executive Express, came to an end in 2005, leaving the area without flights to Stockholm and the outside world, requiring a 4-hour drive or train travel. Mora Municipality managed the airport before Dalaflyget was established. From 2016 until 2018 AIS Airlines operated the line to Stockholm. On 28 February 2018, the route to Stockholm Arlanda was