sentences:  Critics from the scientific community state that no valuable information can be obtained until they can test clean samples of lake water, uncontaminated by drilling fluid.Regardless of the contamination issues, in May 2013 the drilling facility at the Russian Vostok Antarctic station was declared a historic monument as "the result of the recognition of the achievements of the Russian research of Antarctica by the international scientific community, and of the unique operations on opening the subglacial Lake Vostok performed by Russian scientists on February 5, 2012.