Lake Vida, in the McMurdo Dry Valleys of East Antarctica, is one of the largest lakes in the region. It was originally thought to be an ice block lake - frozen solid. However, in 1995, ground penetrating radar surveys revealed a very salty liquid layer (a brine) underlying a 20 m (66 foot) ice cover. This started a series of investigations on the history and physics behind the formation of this unusual lake, as well as on the potential for life in the brine, and how it survives. Lake Vida is not a lake like those of Wisconsin or Michigan. Unlike those lakes, Vida has an ice cover year round. In fact, the ice cover is so thick that water trapped under the ice is completely isolated from other environments. In the summer, new water coming in from glacial streams cannot get under the ice and so it flows on top and freezes. This leads to a unique situation where a thick ice cover on Lake Vida requires occurrence of warm summers (and therefore more stream flow).