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
Siege of Mora country. The Treaty of Versailles in 1919 partitioned the colony between the two powers, creating the new colonies of British Cameroon and French Cameroon. Siege of Mora The Siege of Mora or Siege of Moraberg, between Allied and besieged German troops, took place from August 1914 to February 1916 on and around the Mora mountain in northern Kamerun during the Kamerun Campaign of the First World War. After more than a year of siege German forces on the mountain surrendered, following the escape of many German troops to the neutral Spanish colony of Rio Muni. In early August 1914 the